HCPCS Level II codes are alphanumeric medical procedure codes, primarily for non-physician services such as ambulance services and prosthetic devices.
[1] They represent items, supplies and non-physician services not covered by CPT-4 codes (Level I).
Level II codes are composed of a single letter in the range A to V, followed by 4 digits.
Level II codes are maintained by the US Centers for Medicare and Medicaid Services (CMS).
The CMS maintains a crosswalk from NDC to HCPCS in the form of an Excel file.