Final answer:
The Centers for Medicare & Medicaid Services (CMS) is the agency that maintains and publishes HCPCS Level II, which is a coding system for services and products outside of the CPT system.
Step-by-step explanation:
The Centers for Medicare & Medicaid Services (CMS) is responsible for publishing and maintaining HCPCS Level II. This system is used primarily to identify products, supplies, and services not included in the CPT coding system, such as ambulance services, prosthetic devices, orthotics, and durable medical equipment when used outside a physician's office.