The Dual-Eligible Enrollment That Went Sideways
Marcus is 71, full-benefit dual eligible (Medicare and Medicaid), and lives in a state where Medicaid pays his Part B premium. He has been in Original Medicare with a stand-alone Part D plan. In October he enrolls in a Medicare Advantage Special Needs Plan (D-SNP) during the annual enrollment period, effective January 1. On January 3 he is hospitalized for a fall. The hospital bills Medicare. In February he learns his old Part D plan was never disenrolled and that his D-SNP has a prior authorization requirement for the skilled nursing facility he needs after discharge. He is confused about which plan pays, whether he can switch again, and whether the SNF stay is covered.
1. Who pays for the January hospitalization and the post-acute SNF stay, and how should the prior authorization issue be resolved?
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Once the D-SNP is effective January 1, it is Marcus's Medicare Advantage plan and is responsible for Medicare-covered services, including inpatient hospital and SNF, subject to the plan's rules. Original Medicare does not pay as primary once he is enrolled in MA, except for hospice and certain clinical trials.
The January hospitalization should be billed to the D-SNP, not Original Medicare. If the hospital billed Medicare in error, the claim must be corrected and rebilled to the plan.
For the SNF stay: MA plans may impose prior authorization on SNF admissions, but they must follow CMS coverage rules and cannot apply stricter clinical criteria than Traditional Medicare for the same service. Marcus (or the hospital) should request the authorization immediately, document the skilled need (therapy, nursing, observation), and if denied, request an expedited appeal. Because he is dual eligible, he also has Medicaid appeal rights and can request a Medicaid fair hearing. The plan must provide a written denial with appeal instructions.
2. What are Marcus's options to change plans, and what are the timing constraints?
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Dual-eligible beneficiaries have a continuous special enrollment period (SEP) allowing one plan change per month, effective the first of the following month. So Marcus can switch out of the D-SNP at any time, not just during AEP.
He could: (1) return to Original Medicare plus a stand-alone Part D plan, or (2) enroll in a different D-SNP or MA plan. If he returns to Original Medicare, he may face difficulty obtaining a Medigap policy outside guaranteed-issue windows, though some states offer protections for duals.
He should also confirm the old Part D plan is disenrolled - enrollment in an MA-PD or D-SNP should have automatically disenrolled him, and the fact that it did not is an enrollment error to raise with 1-800-MEDICARE and the plan. Retroactive correction may be possible if the error is documented.
3. How does Medicaid interact with the D-SNP for cost-sharing and the SNF stay?
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As a full-benefit dual, Marcus's Medicare cost-sharing (copays, coinsurance, deductibles) is largely covered by Medicaid through the Medicare Savings Program/QMB, and the D-SNP likely has a zero or near-zero cost-sharing structure for duals. He should not be billed Medicare cost-sharing.
For the SNF stay, Medicaid may cover long-term custodial care once Medicare's SNF benefit ends (up to 100 days per benefit period with a co-pay after day 20, which Medicaid may cover). The D-SNP coordinates with Medicaid; the plan is responsible for Medicare-covered skilled care, and Medicaid wraps around for cost-sharing and for custodial care.
He should ask the plan and Medicaid for a written explanation of benefits and a care-coordination contact, and confirm the SNF is in-network for the D-SNP.