Whenever a person receives any kind of medical treatment, including a diagnosis or the usage of medical supplies, medical billers and coders get to work on the administrative side of that. What they do is assign medical billing codes to each intervention, often using the well known CPT and ICD-10 codes, including the Medicare codes, psychiatric help codes, and dental codes. Generally speaking ICD-10, and to some degree still ICD-9, as well as CPT codes, are the ones that people look for.