Medicaid can be secondary insurance, and it often is
Yes. Medicaid can pay claims after another insurance plan has already paid. When you have both Medicaid and another health plan — usually employer coverage, Medicare, or a plan from the marketplace — Medicaid becomes the secondary payer. It covers costs that your primary insurance did not pay, including copays, coinsurance, and deductibles.
The order matters. Your primary insurance processes the claim first and pays its share. Then Medicaid looks at what remains and decides whether to cover the gap. This arrangement is common and legal in all states, though the rules about what Medicaid will pay as secondary vary by state and by the type of primary insurance you have.
You do not have to choose which insurance to use first — the billing system handles that automatically when you give both insurance cards to your provider. The provider's billing staff submits to the primary plan, waits for the explanation of benefits, and then submits the remaining balance to Medicaid.
Key Takeaways
- Medicaid as secondary insurance covers what your primary plan does not pay, including deductibles, copays, and coinsurance.
- Your primary insurance always processes the claim first; Medicaid then reviews the remaining balance and decides what to cover.
- You must report all insurance coverage to Medicaid when you enroll, and you must keep that information current.
- Some states limit what Medicaid will pay as secondary, particularly for Medicare beneficiaries or those with employer plans.
- Your provider's billing staff handles the coordination automatically once you provide both insurance cards.
When Medicaid becomes secondary to employer insurance
If you have health insurance through your job and also have Medicaid, your employer plan is primary. Medicaid covers the out-of-pocket costs your employer plan leaves behind — the deductible, the copay at the doctor's office, the coinsurance percentage you owe on a hospital stay.
This arrangement is especially common when someone loses employer coverage but keeps Medicaid, or when a household member has Medicaid while another has a job-based plan. The employer plan processes first because it is the coverage you have through work. Medicaid then steps in as a safety net for the remaining balance.
Some states have rules about how much Medicaid will pay as secondary to employer insurance. A few states cap the amount or require that you meet your employer plan's deductible before Medicaid will help. Check your state's Medicaid program or your Medicaid notice to see whether limits explore to your situation.
Medicaid as secondary to Medicare
When someone has both Medicare and Medicaid, Medicaid is almost always secondary. Medicare processes the claim first as the primary payer. Medicaid then covers Medicare's copays, coinsurance, and deductibles — the out-of-pocket costs that Medicare does not pay.
This is one of the most common secondary insurance scenarios. People who are 65 or older and have low income often have both programs. Medicaid's role as secondary is to reduce the cost burden of Medicare, making healthcare more affordable for people on fixed incomes.
Some states are more generous than others about what they will cover as secondary to Medicare. A few states cover the full Medicare deductible; others cover only a portion. Your state's Medicaid program can tell you what it covers in your situation.
Medicaid as secondary to marketplace insurance
If you bought a health plan through the marketplace (Healthcare.gov or your state's exchange) and also have Medicaid, your marketplace plan is primary. Medicaid covers the copays, deductibles, and coinsurance that your marketplace plan does not cover.
This situation arises when someone's income changes after they enroll in a marketplace plan, making them newly may be able to access for Medicaid. You keep both plans active. The marketplace plan continues to process claims first, and Medicaid covers the remaining costs.
You must report the marketplace plan to your state Medicaid program. When you enroll in Medicaid, you will be asked whether you have other insurance. Tell them about the marketplace plan. If your income later drops and you become Medicaid-may be able to access while keeping the marketplace plan, contact your Medicaid caseworker to update your information.
What you must tell Medicaid about your other insurance
When you enroll in Medicaid, you must report any other health insurance you have. This includes employer plans, Medicare, marketplace plans, TRICARE (military insurance), or coverage through a spouse or parent. Medicaid needs this information to coordinate benefits correctly and to know whether it should be primary or secondary.
If your other insurance changes — you lose a job, gain employer coverage, turn 65 and enroll in Medicare — you must report that change to your Medicaid program. Most states allow you to report changes online, by phone, or by mail. The timing matters because Medicaid's role as primary or secondary depends on what other coverage you have.
Failing to report other insurance can delay claims or cause billing problems. Your provider may not know to bill your primary plan first, which can result in Medicaid being billed as primary when it should be secondary. This can trigger overpayments that Medicaid later asks you to repay. Keep your Medicaid caseworker informed of any changes.
How the billing process works with secondary Medicaid
When you see a doctor or go to the hospital with both Medicaid and another insurance, the provider's billing staff submits the claim to your primary insurance first. They wait for the explanation of benefits, which shows what the primary plan paid and what you still owe.
The billing staff then submits the remaining balance to Medicaid with a copy of the primary plan's explanation of benefits. Medicaid reviews the claim and decides whether to cover part or all of the remaining cost. Some claims are covered in full; others are covered partially; some are denied if Medicaid determines the service was not covered under its rules.
This process usually takes two to four weeks after the primary plan pays. You should not receive a bill during this time. If you do, contact the provider's billing office and let them know that the claim is pending with Medicaid as secondary.
State-by-state differences in secondary Medicaid coverage
Rules about what Medicaid will cover as secondary vary by state. Some states cover nearly all out-of-pocket costs left by the primary plan. Others have limits — for example, they may cover copays but not deductibles, or they may cap the total amount Medicaid will pay as secondary in a given year.
A few states have different rules depending on what your primary insurance is. For instance, a state might cover more as secondary to Medicare than as secondary to an employer plan. Some states also have rules about whether Medicaid will cover the primary plan's deductible before you have met it.
Your state's Medicaid program publishes these rules in its policy manual or on its website. You can also ask your Medicaid caseworker what Medicaid will cover as secondary in your specific situation. Knowing these limits helps you understand what out-of-pocket costs you may still owe.
Frequently Asked Questions
Do I have to tell my employer that I have Medicaid?
No. Your employer does not need to know about your Medicaid coverage. You must tell Medicaid about your employer insurance, but the relationship works in only one direction. Your employer's benefits department does not report to Medicaid, and you are not required to disclose Medicaid to your employer.
What if my primary insurance denies a claim?
If your primary insurance denies a claim, Medicaid may still cover it if the service is covered under Medicaid rules. Medicaid does not automatically pay just because the primary plan denied it — Medicaid makes its own decision based on whether the service meets Medicaid's coverage standards. Send the denial letter to Medicaid along with the claim.
Can I choose which insurance to use first?
No. The order is determined by federal and state rules, not by your choice. Employer plans and Medicare are always primary to Medicaid. You cannot ask Medicaid to be primary instead. The billing system follows the legal order automatically.
Will having Medicaid as secondary affect my primary insurance rates?
No. Your employer or marketplace plan rates are not affected by having Medicaid. Medicaid is a separate government program and does not interact with your primary plan's pricing or underwriting.
What happens if I lose my primary insurance?
If you lose your primary insurance, Medicaid becomes your primary coverage. You must report the loss to your Medicaid program so they know to process claims as primary going forward. This usually takes effect on the date you lose the other coverage.