Medicare Claims Processing Manual (Pub. 100-04), Ch. 2 § 10.11
Retroactive Entitlement
10.11 - Retroactive Entitlement
(Rev. 3441, Issued: 01-15-16, Effective; 12-31-13; ASC X12: 01-01-12, MAC
Implementation: 02-16-16; ASC X12: 02-16-16)
When an application for social security benefits is filed by a person 65 years of age or
older, the person may inform the SSO that he/she received hospital services in the
retroactive period of up to six months for which he/she may be entitled to benefits. In
these cases, the provider may bill for covered retroactive services but must verify the
patient’s eligibility through the A/B MAC (A), (B), or (HHH), or DME MAC before
billing. If the patient paid, the provider must refund the appropriate amount to the
patient.