Today you will find The BCBS Alpha Prefix List from IAA to IZZ. The alpha prefix is very important to the identification number. The prefix acts as a key element in confirming the members’ eligibility and coverage information. Prefixes are also used to identify and correctly route claims to the appropriate Blue Cross Blue Shield Plan for processing. Most members with coverage through a Blue Cross Blue Shield Plan are assigned a Three Letter alpha prefix as a part of their unique identification number. The alpha prefix can easily be identified as it is the first three characters.
| BCBS Prefix | State Lookup | BCBS Company |
|---|---|---|
| IAA | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IAB | – | Unallocated/Not Assigned |
| IAC | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IAD | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IAE | Michigan | Blue-Cross Blue-Shield of Michigan |
| IAF | – | Unallocated/Not Assigned |
| IAG | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IAH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IAI | – | Unallocated/Not Assigned |
| IAJ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IAK | California | Blue-Shield of California |
| IAL | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IAM | California | Blue-Shield of California |
| IAN | – | Unallocated/Not Assigned |
| IAO | – | Unallocated/Not Assigned |
| IAP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IAQ | – | Unallocated/Not Assigned |
| IAR | Alabama | Blue-Cross Blue-Shield of Alabama |
| IAS | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IAT BCBS Prefix | New York | Empire Blue-Cross Blue-Shield of New York |
| IAU | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| IAV | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IAW | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IAX | – | Unallocated/Not Assigned |
| IAY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IAZ | – | Unallocated/Not Assigned |
| IBA | Illinois | Blue-Cross Blue-Shield of Illinois |
| IBB | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| IBC | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IBD | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IBE | Illinois | Blue-Cross Blue-Shield of Illinois |
| IBF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IBG | – | Unallocated/Not Assigned |
| IBH | Alabama | Blue-Cross Blue-Shield of Alabama |
| IBI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IBJ | Michigan | Blue-Cross Blue-Shield of Michigan |
| IBK | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IBL | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IBM | California | Blue-Shield of California |
| IBN | – | Unallocated/Not Assigned |
| IBO | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IBP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IBQ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IBR | Michigan | Blue-Cross Blue-Shield of Michigan |
| IBS | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IBT | Illinois | Blue-Cross Blue-Shield of Illinois |
| IBU | Alabama | Blue-Cross Blue-Shield of Alabama |
| IBV | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IBW | Illinois | Blue-Cross Blue-Shield of Illinois |
| IBX | California | Anthem Blue-Cross |
| IBY | – | Unallocated/Not Assigned |
| IBZ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| ICA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ICB | – | Unallocated/Not Assigned |
| ICC | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| ICD | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ICE | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ICF | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ICG | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| ICH | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| ICI | Florida | Florida-Blue |
| ICJ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| ICK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ICL | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ICM | California | Blue-Shield of California |
| ICN | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| ICO | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| ICP | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| ICQ | – | Unallocated/Not Assigned |
| ICR | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| ICS | – | Unallocated/Not Assigned |
| ICT | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| ICU | – | Unallocated/Not Assigned |
| ICV | Michigan | Blue-Cross Blue-Shield of Michigan |
| ICW | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| ICX | – | Unallocated/Not Assigned |
| ICY | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| ICZ | – | Unallocated/Not Assigned |
| IDA | Idaho | Blue-Cross of Idaho |
| IDB | Florida | Florida-Blue |
| IDC | – | Unallocated/Not Assigned |
| IDD | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IDE | Idaho | Blue-Cross of Idaho |
| IDF | Idaho | Blue-Cross of Idaho |
| IDG | – | Unallocated/Not Assigned |
| IDH | – | Unallocated/Not Assigned |
| IDI | California | Blue-Shield of California |
| IDJ | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IDK | New York | Empire Blue-Cross Blue-Shield of New York |
| IDL | Idaho | Blue-Cross of Idaho |
| IDM | Idaho | Blue-Cross of Idaho |
| IDN | Idaho | Blue-Cross of Idaho |
| IDO | Kansas | Blue-Cross Blue-Shield of Kansas |
| IDP | Idaho | Blue-Cross of Idaho |
| IDQ | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IDR | California | Anthem Blue-Cross |
| IDS | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| IDT | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IDU | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IDV | – | Unallocated/Not Assigned |
| IDW | – | Unallocated/Not Assigned |
| IDX | Illinois | Blue-Cross Blue-Shield of Illinois |
| IDY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IDZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IEA | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IEB | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IEC | California | Blue-Shield of California |
| IED BCBS Prefix | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IEE | – | Unallocated/Not Assigned |
| IEF | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IEG | – | Unallocated/Not Assigned |
| IEH | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| IEI | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IEJ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IEK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IEL | Illinois | Blue-Cross Blue-Shield of Illinois |
| IEM | – | Unallocated/Not Assigned |
| IEN | – | Unallocated/Not Assigned |
| IEO BCBS Prefix | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| IEP | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IEQ | New York | Empire Blue-Cross Blue-Shield of New York |
| IER | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IES | Texas | Blue-Cross Blue-Shield of Texas |
| IET | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| IEU | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IEV | – | Unallocated/Not Assigned |
| IEW | Illinois | Blue-Cross Blue-Shield of Illinois |
| IEX | Michigan | Blue-Cross Blue-Shield of Michigan |
| IEY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IEZ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IFA | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IFB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IFC | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IFD | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IFE | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IFF | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IFG | – | Unallocated/Not Assigned |
| IFH | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFI | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFJ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFK | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFL | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IFM | – | Unallocated/Not Assigned |
| IFN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFO | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFP | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| IFQ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IFR | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| IFS | – | Unallocated/Not Assigned |
| IFT | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFU | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFV | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFW | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IFX | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IFY | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IFZ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IGA | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IGB | – | Unallocated/Not Assigned |
| IGC | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IGD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IGE | Alabama | Blue-Cross Blue-Shield of Alabama |
| IGF | California | Blue-Shield of California |
| IGG | California | Blue-Shield of California |
| IGH | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IGI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IGJ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IGK | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IGL | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IGM | – | Unallocated/Not Assigned |
| IGN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IGO | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IGP | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IGQ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IGR | – | Unallocated/Not Assigned |
| IGS | – | Unallocated/Not Assigned |
| IGT | – | Unallocated/Not Assigned |
| IGU | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IGV | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IGW | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IGX | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IGY | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IGZ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IHA | – | Unallocated/Not Assigned |
| IHB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IHC | – | Unallocated/Not Assigned |
| IHD | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| IHE | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IHF | New York | Empire Blue-Cross Blue-Shield of New York |
| IHG | – | Unallocated/Not Assigned |
| IHH | Alabama | Blue-Cross Blue-Shield of Alabama |
| IHI | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IHJ | New York | Empire Blue-Cross Blue-Shield of New York |
| IHK | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IHL | West Virginia | Highmark Blue-Cross Blue-Shield of West Virginia |
| IHM | Delaware | Highmark Blue-Cross Blue-Shield of Delaware |
| IHN | California | Blue-Shield of California |
| IHO | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IHP | – | Unallocated/Not Assigned |
| IHQ | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IHR | California | Blue-Shield of California |
| IHS | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IHT | Alabama | Blue-Cross Blue-Shield of Alabama |
| IHU | – | Unallocated/Not Assigned |
| IHV | – | Unallocated/Not Assigned |
| IHW | California | Blue-Shield of California |
| IHX | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| IHY | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IHZ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IIA | California | Blue-Shield of California |
| IIB | – | Unallocated/Not Assigned |
| IIC | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| IID | Idaho | Blue-Cross of Idaho |
| IIE | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IIF | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IIG | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IIH | – | Unallocated/Not Assigned |
| III | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| IIJ | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IIK | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IIL | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IIM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IIN | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IIO | – | Unallocated/Not Assigned |
| IIP | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IIQ | Florida | Florida-Blue |
| IIR | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IIS | – | Unallocated/Not Assigned |
| IIT | Illinois | Blue-Cross Blue-Shield of Illinois |
| IIU | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IIV | Florida | Florida-Blue |
| IIW | California | Blue-Shield of California |
| IIX | Idaho | Blue-Cross of Idaho |
| IIY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IIZ | Florida | Florida-Blue |
| IJA | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IJB | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| IJC | – | Unallocated/Not Assigned |
| IJD | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| IJE | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IJF | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJG | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJH | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJI | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJJ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJK | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJL | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJM | – | Unallocated/Not Assigned |
| IJN | Florida | Florida-Blue |
| IJO | – | Unallocated/Not Assigned |
| IJP | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IJQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJR | Idaho | Blue-Cross of Idaho |
| IJS | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IJT | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJU | Texas | Blue-Cross Blue-Shield of Texas |
| IJV | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJW | – | Unallocated/Not Assigned |
| IJX | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IJY | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| IJZ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IKA | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| IKB | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IKC | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IKD | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IKE | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IKF | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IKG | – | Unallocated/Not Assigned |
| IKH | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IKI | Florida | Florida-Blue |
| IKJ | – | Unallocated/Not Assigned |
| IKK | Michigan | Blue-Cross Blue-Shield of Michigan |
| IKL | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IKM | – | Unallocated/Not Assigned |
| IKN | – | Unallocated/Not Assigned |
| IKO | Delaware | Highmark Blue-Cross Blue-Shield of Delaware |
| IKP | – | Unallocated/Not Assigned |
| IKQ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IKR | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IKS | California | Blue-Shield of California |
| IKT | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| IKU | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IKV | Michigan | Blue-Cross Blue-Shield of Michigan |
| IKW | – | Unallocated/Not Assigned |
| IKX | Michigan | Blue-Cross Blue-Shield of Michigan |
| IKY | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| IKZ | – | Unallocated/Not Assigned |
| ILA | New York | Empire Blue-Cross Blue-Shield of New York |
| ILB | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| ILC | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| ILD | Michigan | Blue-Cross Blue-Shield of Michigan |
| ILE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| ILF | Alabama | Blue-Cross Blue-Shield of Alabama |
| ILG | California | Blue-Shield of California |
| ILH | California | Anthem Blue-Cross |
| ILI | – | Unallocated/Not Assigned |
| ILJ | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| ILK | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| ILL | California | Anthem Blue-Cross |
| ILM | – | Unallocated/Not Assigned |
| ILN | – | Unallocated/Not Assigned |
| ILO | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| ILP | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| ILQ | – | Unallocated/Not Assigned |
| ILR | – | Unallocated/Not Assigned |
| ILS | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| ILT | Illinois | Blue-Cross Blue-Shield of Illinois |
| ILU | – | Unallocated/Not Assigned |
| ILV | Alabama | Blue-Cross Blue-Shield of Alabama |
| ILW | California | Blue-Shield of California |
| ILX | Alabama | Blue-Cross Blue-Shield of Alabama |
| ILY BCBS Prefix | California | Anthem Blue-Cross |
| ILZ | Michigan | Blue-Cross Blue-Shield of Michigan |
| IMA | New York | Excellus Blue-Cross Blue-Shield of New York |
| IMB | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IMC | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IMD | – | Unallocated/Not Assigned |
| IME | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IMF | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IMG | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IMH | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| IMI | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IMJ | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IMK | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| IML | – | Unallocated/Not Assigned |
| IMM | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IMN | – | Unallocated/Not Assigned |
| IMO | – | Unallocated/Not Assigned |
| IMP | – | Unallocated/Not Assigned |
| IMQ | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| IMR | Alabama | Blue-Cross Blue-Shield of Alabama |
| IMS | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| IMT | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IMU | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IMV | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IMW | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IMX | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IMY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IMZ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| INA | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| INB | Alaska | Premera Blue-Cross of Alaska |
| INC | California | Anthem Blue-Cross |
| IND | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| INE | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| INF | – | Unallocated/Not Assigned |
| ING | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| INH | – | Unallocated/Not Assigned |
| INI | Delaware | Highmark Blue-Cross Blue-Shield of Delaware |
| INJ | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| INK | California | Anthem Blue-Cross |
| INL | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| INM | – | Unallocated/Not Assigned |
| INN | – | Unallocated/Not Assigned |
| INO | California | Blue-Shield of California |
| INP | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| INQ | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| INR | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| INS | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| INT | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| INU | – | Unallocated/Not Assigned |
| INV | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| INW | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| INX | – | Unallocated/Not Assigned |
| INY | California | Anthem Blue-Cross |
| INZ | – | Unallocated/Not Assigned |
| IOA | – | Unallocated/Not Assigned |
| IOB | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| IOC | California | Blue-Shield of California |
| IOD | Michigan | Blue-Cross Blue-Shield of Michigan |
| IOE | New York | Empire Blue-Cross Blue-Shield of New York |
| IOF | California | Blue-Shield of California |
| IOG | New York (Northeastern) | Blue-Shield of Northeastern New York |
| IOH | – | Unallocated/Not Assigned |
| IOI | Michigan | Blue-Cross Blue-Shield of Michigan |
| IOJ | Michigan | Blue-Cross Blue-Shield of Michigan |
| IOK | – | Unallocated/Not Assigned |
| IOL | Michigan | Blue-Cross Blue-Shield of Michigan |
| IOM | Michigan | Blue-Cross Blue-Shield of Michigan |
| ION | Florida | Florida-Blue |
| IOO | Michigan | Blue-Cross Blue-Shield of Michigan |
| IOP | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IOQ | Michigan | Blue-Cross Blue-Shield of Michigan |
| IOR | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IOS | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| IOT | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IOU | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IOV | – | Unallocated/Not Assigned |
| IOW | – | Unallocated/Not Assigned |
| IOX | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IOY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IOZ | California | Blue-Shield of California |
| IPA | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IPB | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IPC | – | Unallocated/Not Assigned |
| IPD | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IPE | California | Blue-Shield of California |
| IPF | – | Unallocated/Not Assigned |
| IPG | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IPH | Kansas | Blue-Cross Blue-Shield of Kansas |
| IPI | – | Unallocated/Not Assigned |
| IPJ | – | Unallocated/Not Assigned |
| IPK | California | Blue-Shield of California |
| IPL | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| IPM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IPN | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IPO | – | Unallocated/Not Assigned |
| IPP | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IPQ | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IPR | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IPS | California | Blue-Shield of California |
| IPT | Illinois | Blue-Cross Blue-Shield of Illinois |
| IPU | Idaho | Blue-Cross of Idaho |
| IPV | Michigan | Blue-Cross Blue-Shield of Michigan |
| IPW | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IPX | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IPY | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IPZ | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| IQA | – | Unallocated/Not Assigned |
| IQB | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQC | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| IQD | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQE | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| IQF | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| IQG | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IQH | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| IQI | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IQJ | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IQK | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQL | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQM | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQN | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IQO | California | Anthem Blue-Cross |
| IQP | – | Unallocated/Not Assigned |
| IQQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQR | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IQS | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IQT | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IQU | Michigan | Blue-Cross Blue-Shield of Michigan |
| IQV | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQW | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQX | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IQY | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IQZ | – | Unallocated/Not Assigned |
| IRA | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| IRB | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IRC | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| IRD | – | Unallocated/Not Assigned |
| IRE | – | Unallocated/Not Assigned |
| IRF | – | Unallocated/Not Assigned |
| IRG | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IRH | – | Unallocated/Not Assigned |
| IRI | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| IRJ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IRK | Alabama | Blue-Cross Blue-Shield of Alabama |
| IRL | – | Unallocated/Not Assigned |
| IRM | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| IRN | – | Unallocated/Not Assigned |
| IRO | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IRP | Florida | Florida-Blue |
| IRQ | Florida | Florida-Blue |
| IRR | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IRS | Florida | Florida-Blue |
| IRT | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IRU | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| IRV | – | Unallocated/Not Assigned |
| IRW | California | Blue-Shield of California |
| IRX | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IRY | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IRZ | California | Anthem Blue-Cross |
| ISA | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| ISB | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| ISC | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| ISD | Arizona | Blue-Cross Blue-Shield of Arizona |
| ISE | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| ISF | – | Unallocated/Not Assigned |
| ISG | – | Unallocated/Not Assigned |
| ISH | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ISI | California | Blue-Shield of California |
| ISJ | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| ISK | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| ISL | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| ISM | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| ISN | Idaho | Blue-Cross of Idaho |
| ISO | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| ISP | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| ISQ | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| ISR | – | Unallocated/Not Assigned |
| ISS | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IST | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| ISU | Idaho | Blue-Cross of Idaho |
| ISV | – | Unallocated/Not Assigned |
| ISW | Idaho | Blue-Cross of Idaho |
| ISX | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| ISY | – | Unallocated/Not Assigned |
| ISZ | Idaho | Blue-Cross of Idaho |
| ITA | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ITB | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| ITC | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| ITD | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| ITE | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| ITF | Michigan | Blue-Cross Blue-Shield of Michigan |
| ITG | – | Unallocated/Not Assigned |
| ITH | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| ITI | – | Unallocated/Not Assigned |
| ITJ | – | Unallocated/Not Assigned |
| ITK | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| ITL | – | Unallocated/Not Assigned |
| ITM | Michigan | Blue-Cross Blue-Shield of Michigan |
| ITN | – | Unallocated/Not Assigned |
| ITO | New York (Northeastern) | Blue-Shield of Northeastern New York |
| ITP | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| ITQ | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| ITR | New York | Empire Blue-Cross Blue-Shield of New York |
| ITS | Arkansas | Arkansas Blue-Cross Blue-Shield |
| ITT | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| ITU | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| ITV | – | Unallocated/Not Assigned |
| ITW | Illinois | Blue-Cross Blue-Shield of Illinois |
| ITX | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| ITY | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| ITZ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IUA | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IUB | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| IUC | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IUD | – | Unallocated/Not Assigned |
| IUE | New York | Empire Blue-Cross Blue-Shield of New York |
| IUF | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IUG | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| IUH | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IUI | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| IUJ | – | Unallocated/Not Assigned |
| IUK | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IUL | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IUM | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IUN | – | Unallocated/Not Assigned |
| IUO | New York | Empire Blue-Cross Blue-Shield of New York |
| IUP | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| IUQ | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IUR | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IUS | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IUT | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IUU | – | Unallocated/Not Assigned |
| IUV | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| IUW | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IUX | – | Unallocated/Not Assigned |
| IUY | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IUZ | – | Unallocated/Not Assigned |
| IVA | – | Unallocated/Not Assigned |
| IVB | Michigan | Blue-Cross Blue-Shield of Michigan |
| IVC | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| IVD | – | Unallocated/Not Assigned |
| IVE | California | Blue-Shield of California |
| IVF | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| IVG | – | Unallocated/Not Assigned |
| IVH | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| IVI | Louisiana | Blue-Cross Blue-Shield of Louisiana |
| IVJ | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IVK | Mississippi | Blue-Cross Blue-Shield of Mississippi |
| IVL | – | Unallocated/Not Assigned |
| IVM | – | Unallocated/Not Assigned |
| IVN | Tennessee | Blue-Cross Blue-Shield of Tennessee |
| IVO | – | Unallocated/Not Assigned |
| IVP | Michigan | Blue-Cross Blue-Shield of Michigan |
| IVQ | – | Unallocated/Not Assigned |
| IVR | Arizona | Blue-Cross Blue-Shield of Arizona |
| IVS | California | Anthem Blue-Cross |
| IVT | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IVU | Florida | Florida-Blue |
| IVV | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| IVW | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IVX | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IVY | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| IVZ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IWA BCBS Prefix | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IWB | – | Unallocated/Not Assigned |
| IWC | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IWD | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IWE | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IWF | New York | Empire Blue-Cross Blue-Shield of New York |
| IWG | New York | Excellus Blue-Cross Blue-Shield of New York |
| IWH | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IWI | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IWJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IWK | Michigan | Blue-Cross Blue-Shield of Michigan |
| IWL | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IWM | – | Unallocated/Not Assigned |
| IWN | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IWO | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IWP | Michigan | Blue-Cross Blue-Shield of Michigan |
| IWQ | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IWR | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| IWS | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IWT | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| IWU | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| IWV | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| IWW | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| IWX | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| IWY | New York | Empire Blue-Cross Blue-Shield of New York |
| IWZ | Michigan | Blue-Cross Blue-Shield of Michigan |
| IXA | Arkansas | Arkansas Blue-Cross Blue-Shield |
| IXB | California | Blue-Shield of California |
| IXC | – | Unallocated/Not Assigned |
| IXD | – | Unallocated/Not Assigned |
| IXE | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IXF | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IXG | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IXH | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IXI | Florida | Florida-Blue |
| IXJ | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| IXK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IXL | California | Blue-Shield of California |
| IXM | California | Blue-Shield of California |
| IXN | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IXO | California | Blue-Shield of California |
| IXP | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| IXQ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IXR | Michigan | Blue-Cross Blue-Shield of Michigan |
| IXS | – | Unallocated/Not Assigned |
| IXT | – | Unallocated/Not Assigned |
| IXU | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IXV | – | Unallocated/Not Assigned |
| IXW | Michigan | Blue-Cross Blue-Shield of Michigan |
| IXX | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IXY | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IXZ | – | Unallocated/Not Assigned |
| IYA | – | Unallocated/Not Assigned |
| IYB | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IYC | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IYD | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| IYE | – | Unallocated/Not Assigned |
| IYF | – | Unallocated/Not Assigned |
| IYG | Florida | Florida-Blue |
| IYH | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| IYI | Michigan | Blue-Cross Blue-Shield of Michigan |
| IYJ | Kansas City | Blue-Cross Blue-Shield of Kansas City |
| IYK | – | Unallocated/Not Assigned |
| IYL | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IYM | – | Unallocated/Not Assigned |
| IYN | Alaska | Premera Blue-Cross of Alaska |
| IYO | – | Unallocated/Not Assigned |
| IYP | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| IYQ | South Carolina | Blue-Cross Blue-Shield of South Carolina |
| IYR | Florida | Florida-Blue |
| IYS | – | Unallocated/Not Assigned |
| IYT | – | Unallocated/Not Assigned |
| IYU | Michigan | Blue-Cross Blue-Shield of Michigan |
| IYV | Michigan | Blue-Cross Blue-Shield of Michigan |
| IYW | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IYX | Michigan | Blue-Cross Blue-Shield of Michigan |
| IYY | Michigan | Blue-Cross Blue-Shield of Michigan |
| IYZ | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZA | Alabama | Blue-Cross Blue-Shield of Alabama |
| IZB | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| IZC | – | Unallocated/Not Assigned |
| IZD | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IZE | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| IZF | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| IZG | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZH | – | Unallocated/Not Assigned |
| IZI | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZJ | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZK | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| IZL | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZM | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZN | – | Unallocated/Not Assigned |
| IZO | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZP | Idaho | Blue-Cross of Idaho |
| IZQ | – | Unallocated/Not Assigned |
| IZR | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZS | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZT | – | Unallocated/Not Assigned |
| IZU | South Dakota/Iowa | Wellmark Blue-Cross Blue-Shield |
| IZV | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| IZW | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZX | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZY | Michigan | Blue-Cross Blue-Shield of Michigan |
| IZZ | – | Unallocated/Not Assigned |
Some identification cards may not include an alpha prefix, which may indicate that the claim filing instructions for these type policies are different. We suggest that you verify claim filing instructions during the time eligibility information is obtained. If not, please follow the instructions on the back of the member’s ID card or contact the plan directly. Member eligibility can be obtained at 1 (800) 676-BLUE (2583). Once connected, you will then simply provide the alpha prefix and the operator will then route you to the member’s plan. Helpful Tips Related to the Alpha Prefix:
- Do not omit or randomly select an alpha prefix.
- Do not substitute another Blue Cross Blue Shield Member’s prefix.
- Include the alpha prefix and all alpha characters preceding the alpha prefix on all correspondence and claims submitted to Blue Cross Blue Shield of Texas.
- The alpha prefix is always three letters followed by the member’s ID number which can be from 6 up to 14 characters total.
- If possible, make copies of the member’s ID card (front and back) for your records.
- We recommend that you obtain a copy of the ID card any time there has been a coverage or policy change. If there are no changes, we suggest that you obtain card copies annually.
About us
Billing Executive – a Medical Billing and Coding Knowledge Base for Physicians, Office staff, Medical Billers and Coders, including resources pertaining to HCPCS Codes, CPT Codes, ICD-10 billing codes, Modifiers, POS Codes, Revenue Codes, Billing Errors, Denials and Rejections.
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