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Billing and coding
ABN Modifiers
| Question | Answer |
|---|---|
| Provider believes a service will be denied as not medically necessary but does not have an ABN due to circumstances. | Modifier GZ |
| Waiver of liability statement issued as required by payer policy, mandatory ABN was issued for a service. | Modifier GA |
| Provider considers the service excluded and did not complete an ABN because none was required. | Modifier GY |
| “Notice of liability issued, voluntary under payer policy” | Modifier GX |
| This equation determines how patient responsibility is calculated from an explanation of benefits (EOB) | Charged amount - Payment amount - Adjustment amount = Patient responsibility |
| Another term for contractual adjustment | Write off |
| MPFS is the abbreviation for the | Medicare Physician Fee Schedule. |
| The Medicare Physician Fee Schedule is based on | RBRVS fees. |
| RBRVS is the abbreviation for | Resource-based relative value scale. |
| GPCI is the abbreviation for | Geographic practice cost index |