What if an MSP refund is not made at the time the provider notifies Medicare of the duplicate primary payment?
Providers are required to pay Medicare within 60 days from the date a payment is received from another payer (primary to Medicare) for the same service for which Medicare paid.
However, if a demand letter is needed by the provider’s accounting department, submit the MSP Overpayment Refund form and the other insurer’s EOB and/or payment information (e.g., a copy of the check) to Medicare.