ABC code modifiers serve as practitioner identifiers and fit into the same modifier spaces as other standard code modifiers. Practitioner identifiers are two-character indicators of the practitioner type that follow five-character ABC codes. These identifiers indicate the practitioner who delivered an ABC-coded intervention.

ABC code modifiers currently represent the following practitioner types:

ABC code modifiers were created to support research, management and commerce by allowing users to

The following table lists practitioner identifiers, credential abbreviations and the practice specialties they signify.