AHA Coding Clinic® for HCPCS - 2003 Issue 1

HCPCS modifiers GA, GY and GZ

Since the release of instructions related to the implementation of National Coverage Determinations (NCDs) for clinical diagnostic laboratory services published in previous program memorandums (PMs) numerous questions have arisen. The Centers for Medicare & Medicaid Services (CMS) provided clarification to these questions by publishing several responses in PM AB-02-134. At a recent meeting with CMS, a request for clarification of the responses provided in PM AB-02-134, for questions 2 and 3 was made. It was felt, the responses did not differentiate between the types of laboratories. Additionally, a request was submitted for an explanation of whether modifiers GA, GY...

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