The Australian Classification of Health Interventions has also been in use since 1998. ACHI was based on the Medicare Benefits Schedule (MBS) and was previously known as the Medicare Benefits Schedule-Extended (MBS-E). The NCCH developed it with assistance from specialist clinicians and clinical coders.

ACHI codes have seven digits. The first five digits are the MBS item number where one exists. The two-digit extension represents specific interventions included in that item. The classification is structured by body system, site and intervention type. Interventions not currently listed in MBS have also been included (e.g. dental, allied health interventions, cosmetic surgery). ACHI consists of a tabular list of interventions and accompanying alphabetic index.