Which coding system includes five-digit alphanumeric codes for services and procedures not classified in the CPT?

The correct answer is HCPCS Level II, which is a coding system that includes five-digit alphanumeric codes used to represent various health care services, supplies, and procedures that are not classified in the Current Procedural Terminology (CPT) system. HCPCS Level II codes are primarily used for billing purposes in Medicare and other health insurance programs, helping to standardize billing across different healthcare providers.

These codes encompass a wide range of non-physician services, such as durable medical equipment (DME), prosthetics, non-physician services, and specific drugs not covered by the CPT. This classification aids healthcare providers in obtaining reimbursement for these items and services, ensuring that both providers and payers have a common framework for coding and billing.

In contrast, the other options refer to different coding systems: CPT is focused mainly on medical procedures and services provided by physicians; HCPCS Level III is a now-retired system that was used for local codes not found in the other coding categories; and ICD-10-PCS is used for inpatient hospital procedures and does not include the primary variety of outpatient services and DME that HCPCS Level II covers.