If you are on Medicaid, a non-participating provider generally cannot bill you for a covered service. Federal law requires state Medicaid plans to make providers accept the program’s payment as payment in full, and that protection follows the patient even when the provider never enrolled in Medicaid at all.1eCFR. 42 CFR 447.15 – Acceptance of State Payment as Payment in Full The only things you can be asked to pay are any small copayment your state plan allows and the full cost of services Medicaid doesn’t cover, and the second one requires your written agreement in advance.
How the Rule Reaches Providers Who Aren’t Enrolled
The prohibition works through the provider, not through enrollment status. When a provider knowingly treats someone on Medicaid, they are bound by Medicaid’s payment rules whether or not they participate in the program. A non-enrolled provider cannot submit a claim to Medicaid and receives nothing from the agency, but they still cannot send the patient a bill for the service. Federal regulations require that providers accept the Medicaid payment, plus any allowable cost-sharing, as the full price of a covered service.1eCFR. 42 CFR 447.15 – Acceptance of State Payment as Payment in Full For a non-enrolled provider who treats a Medicaid beneficiary, that payment amount is $0.
The same rule blocks balance billing, where a provider tries to charge the patient the gap between their standard rate and what Medicaid would pay. Balance billing is common in commercial insurance. It is prohibited outright in Medicaid for covered services.2Office of the Law Revision Counsel. 42 USC 1396a – State Plans for Medical Assistance
Verifying insurance is the provider’s job. If the office learns you have Medicaid and the provider doesn’t participate, they can decline to see you or they can treat you knowing they won’t be paid. What they cannot do is treat you and then send you a bill.
The Copayment You May Actually Owe
Medicaid isn’t free at the point of care for everyone. States are allowed to charge small copayments on certain services, but the amounts are capped at a few dollars and adjusted each year for inflation.3eCFR. 42 CFR Part 447 – Payments for Services Children under 18 who qualify for mandatory Medicaid coverage, pregnant women, and certain other groups are exempt from cost-sharing entirely. Across all services, a family’s total cost-sharing cannot exceed 5 percent of family income.
One protection matters in the exam room: a provider cannot refuse a covered service because you can’t pay the copayment at the visit. The copayment stays a legal debt, but inability to pay it is not grounds to turn you away.
When a Provider Can Legitimately Bill You
The billing prohibition only covers services Medicaid pays for. If a service is entirely outside your state’s Medicaid plan, a provider can bill you, but only if they got your informed written agreement first.
That agreement has to be specific. It should name the service, state clearly that Medicaid does not cover it, and give an estimated cost. You sign before treatment, and the provider keeps the signed form in your record. A bill that shows up after the fact, with no prior signed agreement, is not enforceable against you under Medicaid rules. This is not the Medicare Advance Beneficiary Notice, which is a different form for a different program; Medicaid simply requires an informed written financial agreement.
Services that often fall outside Medicaid coverage include:
- Elective cosmetic procedures, though reconstructive surgery after cancer or other medical conditions may qualify
- Adult dental care in states that cover little or none of it, though children’s dental coverage is mandatory
- Experimental treatments without FDA approval or established clinical evidence
- Over-the-counter medications, vitamins, and supplements
Coverage varies significantly by state. Something non-covered where you live may be a standard benefit somewhere else, and it is the provider’s job to confirm a service isn’t covered before asking you to pay for it.
Emergency Care Doesn’t Change the Rule
The Emergency Medical Treatment and Labor Act requires Medicare-participating hospitals to screen and stabilize anyone with an emergency medical condition, regardless of insurance or ability to pay.4Centers for Medicare & Medicaid Services. Emergency Medical Treatment and Labor Act (EMTALA) That covers essentially every hospital with an emergency department.5U.S. Department of Health and Human Services Office of Inspector General. The Emergency Medical Treatment and Labor Act (EMTALA)
Even in an emergency, a non-participating provider who treats a Medicaid patient cannot bill the patient directly for covered services. Their route to payment runs through the state Medicaid agency, which has a process for reimbursing out-of-network emergency services at the state’s Medicaid rate. That transaction stays between the provider and the state. You are not part of it.
If You Paid Out of Pocket and Got Approved for Medicaid Later
Federal law requires state Medicaid plans to cover services provided up to three months before the month you applied, as long as you were eligible during that period.2Office of the Law Revision Counsel. 42 USC 1396a – State Plans for Medical Assistance Apply in June, and coverage can be backdated to March.
Services you already paid for during that window become Medicaid-covered services. The provider can submit claims to Medicaid for those dates. And the billing prohibition applies retroactively too: if the provider collected money from you for what is now a covered service, they should refund you and bill Medicaid instead. Contact your state Medicaid agency for the specific claims and refund process where you live.
Extra Protection for QMB and Dual-Eligible Patients
If you have both Medicare and Medicaid, and you qualify as a Qualified Medicare Beneficiary, you get an added layer of protection. Federal law prohibits all Medicare providers and suppliers from billing QMB patients for any Medicare Part A or Part B cost-sharing, including deductibles, coinsurance, and copayments.6CMS. Prohibition on Billing Qualified Medicare Beneficiaries
This applies to every Medicare provider, not just those enrolled in Medicaid. A doctor who takes Medicare but not Medicaid still cannot bill a QMB patient for Medicare cost-sharing, even if Medicaid ends up paying nothing toward those amounts, and even if you receive care in a different state.6CMS. Prohibition on Billing Qualified Medicare Beneficiaries A provider who has already billed you or sent the account to collections is required to recall the bill and refund anything they collected.
What To Do If You Get a Bill You Shouldn’t Have Received
Don’t pay it, and don’t ignore it.
Start with the customer service number on your Medicaid card. If you are in a managed care plan, the plan is required to resolve billing disputes with providers on your behalf. Tell them you received a bill for a covered service and ask them to intervene.
If that doesn’t resolve it, or if you are in fee-for-service Medicaid, contact your state Medicaid agency directly. Every state has a complaint process, and many have an ombudsman or beneficiary helpline. You can also file a complaint with your state attorney general’s office, because improperly billing a Medicaid patient can qualify as an unfair or deceptive practice.
Keep everything. Save each bill, and write down the date, name, and substance of every phone call. If the provider threatens collections or reports the debt to a credit bureau, that record becomes your evidence. Many Medicaid beneficiaries also qualify for free help from a local legal aid organization, which typically serves households at 125 to 200 percent of the federal poverty level.