Who maintains the HCPCS codes?

The Centers for Medicare and Medicaid Services (CMS) is responsible for maintaining the Healthcare Common Procedure Coding System (HCPCS) codes. This includes the management and updates of the codes that are used for billing and reimbursement purposes in the United States, particularly for services and products that are covered under Medicare and Medicaid.

CMS oversees the entire process of developing and updating these codes to ensure they reflect current medical practices, billing procedures, and technological advancements. This is essential for maintaining an accurate and efficient healthcare billing process.

The other organizations mentioned have different focuses; for instance, the American Medical Association (AMA) primarily develops and maintains the Current Procedural Terminology (CPT) codes, which are also used in medical billing but are distinct from HCPCS. The National Institutes of Health (NIH) is mainly involved in medical research, while the World Health Organization (WHO) focuses on international public health. Thus, CMS is the correct answer as they are specifically tasked with the upkeep and management of HCPCS codes.