Billing with a GP Modifier

Q: When patients have a true Medicare secondary insurance we’ve always billed other Medicare non-covered codes such as G0283 for electric stimulation with modifier GY because we are aware Medicare will not pay for that service but the secondary insurance does. We just were notified by our MAC that GY is not a valid modifier and I have to enter a GP or other therapy modifier. What is the new proper modifier to enter?

Billing Requirements for Medicare Secondary Payer (MSP) Provisions

MSP provisions apply to situations when Medicare is not the beneficiary’s primary health insurance coverage. Before you submit a claim, you must determine whether Medicare is the primary or secondary payer for all inpatient admissions and outpatient encounters, thereby assisting in ensuring the appropriate use of Medicare funds. If another …