E/M — Evaluation and Management

Office-visit codes. In AHCIP, the 03.xx series (03.03A focused, 03.04A comprehensive, 03.05A complex). In US-CPT, the 992xx series (99213 focused, 99214 moderate, 99215 complex). E/M billing is the highest-yield audit area because modifier-25, dx-linkage, and time-based coding all cluster here.