Distinguishing Between the GA, GX, GY and GZ Modifiers

There are many modifiers providers of therapy services are use to adding to CPT codes on the claim forms. Common modifiers include the KX modifier, 59-modifier and therapy specific modifiers of GN, GO and GP. But do you know the following modifiers and when to use them: GA, GX, GY and GZ? In this article, I will discuss when to use these modifiers on a CPT code on the claim form for therapy services. In addition, if you have additional questions on when to issue an advance beneficiary notice of non-coverage (ABN) form to a Medicare beneficiary, check out my ABN FAQs HERE.

The GA modifier is defined as waiver of liability statement on file. The GA modifier must be used when therapy provider wants to indicate that they expect that