Medicare GA, GX, GY, GZ Modifiers – What is the difference?
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WEBOct 1, 2023 · How is the GZ modifier used in Medicare billing? The GZ is used when a service is expected to be denied by Medicare due to a lack of medical necessity, and no ABN was issued. Claims with the GZ are automatically denied, and the provider is liable for the charges. Can the GY modifier be used for bundled procedures or add-on codes?
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