What Is Dual Eligible
A dual eligible person is enrolled in both Medicare and Medicaid simultaneously. Medicare is federal health insurance for people 65 and older or those with specific disabilities. Medicaid is a joint federal and state program for low-income individuals. When you qualify for both, Medicaid acts as your secondary payer and covers some costs Medicare doesn't, including copayments, coinsurance, and deductibles.
Approximately 12 million Americans are dual eligible. The income threshold varies by state, but generally you must have income under 100% to 120% of the federal poverty level. Each state administers its own Medicaid program differently, so your coverage and cost-sharing rules depend on where you live.
How Dual Eligible Affects Claims and Appeals
When you file a medical claim as a dual eligible beneficiary, the claim processes differently than it would for a Medicare-only enrollee. Medicare processes the claim first and generates an Explanation of Benefits (EOB). Medicaid then reviews what Medicare approved or denied, and covers secondary liability according to state rules.
This sequential processing creates specific timing and documentation requirements. If you receive a denial from Medicare, you have 120 days from the EOB date to file an internal appeal with Medicare. Once Medicare issues a final decision, you can then appeal to Medicaid if appropriate. Some states allow external appeals through independent review organizations, but deadlines and procedures vary significantly.
Prior authorization requirements are particularly important for dual eligible beneficiaries. While Medicare may require prior authorization for certain procedures, your state's Medicaid program may have additional or different authorization requirements. Failing to obtain authorization from both plans can result in denied claims that are difficult to overturn.
State Variations in Dual Eligible Coverage
- Medicaid Savings Programs: Qualified Medicare Beneficiary (QMB) programs cover Medicare premiums and cost-sharing. Specified Low-Income Medicare Beneficiary (SLMB) programs cover Part B premiums only. These programs vary in eligibility and benefits by state.
- Copayment Limits: States cap what Medicaid will cover for copayments. Some states cover copayments up to $3.50 for office visits, while others cap total cost-sharing per service.
- Prior Authorization Rules: Some states require Medicaid prior authorization for services Medicare already authorized. California and New York have different timelines and approval processes than Texas or Florida.
- Medical Necessity Standards: State Medicaid programs apply their own medical necessity criteria, which may be stricter or more lenient than Medicare's standards. This creates situations where Medicare approves a service but Medicaid denies it as medically unnecessary.
Common Questions
- If Medicare denies a claim, can Medicaid override that decision? No. Medicaid cannot approve a service Medicare denies as not medically necessary or covered. However, if Medicare approves something but limits the quantity or frequency, Medicaid may cover the denied portion if the state program covers that service.
- Do I need prior authorization from both plans? Often yes. Always obtain prior authorization from both Medicare and your state Medicaid program before receiving non-emergency services. Submit authorization requests simultaneously to both plans to avoid processing delays.
- How do I read my EOB when I'm dual eligible? You'll receive separate EOBs from Medicare and Medicaid. The Medicare EOB shows what Medicare approved and paid. The Medicaid EOB shows what Medicaid paid as secondary coverage. The provider's final bill to you should reflect both payments combined.