According to the CPT book, a Modifier is a "method to record or indicate that a service or process that has been done has been amended by some specific condition but not amended in its definition or code." CPT Modifiers are always two characters long and can be numeric or alphanumeric. The majority of CPT modifiers are numeric; however, there are a few that are … [Read more...] about What Do You Need To Know About Medical Coding Modifiers?