When do we report modifier GX?
Modifier GX refers to a notice of liability issued, voluntary under payer policy (reasonable and necessary item/service associated with a GA or GZ modifier). This modifier should be used to report when a voluntary ABN was issued for a service. Modifier GX must be submitted with non-covered charges only and will be denied by the Medicare contractor as a beneficiary liability. These changes are informational only for Medicare Part B.
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