Around 78% of Medicaid beneficiaries are enrolled in commercial managed care plans. So "billing Medicaid" usually means billing an insurer with its own network, authorization rules, filing window and appeal process — not the state.
Ask a practice manager who pays their Medicaid claims and the answer is usually "the state." It is the natural answer. It is also, for most claims, wrong — and the gap between the two explains a surprising share of Medicaid denials.
Nationally, about 78% of Medicaid beneficiaries are enrolled in comprehensive managed care organizations, and roughly half of all Medicaid spending flows through them. The card says Medicaid. The program has a state name on it. But the entity adjudicating the claim, setting the filing window, and deciding the authorization rules is a commercial insurer under contract to the state.
Why this changes the work
If Medicaid were one payer, one internal rule would be enough. It is not, and treating it as one produces a specific set of failures.
- Filing windows differ per plan. The state program may allow one window; the managed care plan operating inside it may allow a shorter one. A single internal deadline is certain to be wrong somewhere.
- Authorization rules are the plan's, not the state's. Two patients with the same coverage on paper can have different requirements because they are enrolled with different plans.
- Appeals go to the plan first. Appealing to the state on a managed care denial wastes the clock that was actually running.
Five companies, half the market
There is a useful concentration here. Centene, CVS Health, Elevance, Molina and UnitedHealth together account for roughly half of Medicaid managed care enrollment nationally. Learning five payers properly covers a disproportionate share of the work — which is a far more tractable project than "learn Medicaid."
The states that are different
A handful of states run little or no comprehensive managed care, and there the claim really does go to the state. That is now the less common arrangement, but it is not rare enough to ignore, and it is exactly the kind of thing a national billing process gets wrong by assuming.
The practical version of all this: before you bill, know which plan the patient is actually enrolled with, and check it every visit. Medicaid coverage churns month to month in a way commercial coverage does not, and a verification from three weeks ago is not evidence of anything.
Contract with the plans, not just the state
State Medicaid enrollment does not put you in a managed care plan’s network. Each plan is a separate credentialing and contracting exercise, with its own timeline.
Practices that enroll with the state and start scheduling discover the gap when the first claims deny as out of network.
Keep a plan reference sheet
Filing window, payer ID, authorization requirements, portal and appeal path per plan. Most states have a handful of plans and the differences between them are where claims die.
Verify the plan at every visit
Beneficiaries change plans more often than they change coverage, and a claim to the previous plan denies as cleanly as one to the state.
Eligibility active is not the answer to the question of who to bill.
Enrollment and contracting are separate steps
State Medicaid enrollment establishes you as a Medicaid provider. It does not put you in any managed care plan’s network, and each plan runs its own credentialing and contracting with its own timeline behind the state process.
Practices that enroll with the state and begin scheduling managed care patients discover the gap only when claims deny as out of network, by which point care has been delivered.
The plan you are contracted with may not be the plan the patient has
Beneficiaries switch plans during open enrollment and sometimes outside it, and there is no notification to providers. A patient seen for years under one plan can arrive with another.
That is the strongest practical argument for verifying the plan rather than eligibility at every visit.
What managed care changes about the work
Authorization requirements the state program does not impose. Networks that exclude providers the state would pay. Formularies and preferred vendors for equipment and drugs. Appeal processes that run through the plan before any state route opens.
Each of those is a place where a claim behaves like commercial insurance while everyone in the practice is thinking about Medicaid, and that mismatch is where the denials come from.
The state still matters
The state sets the contract the plans operate under, which means some protections and some rules are uniform across every plan in that state — timely filing floors, appeal rights, and the payer-of-last-resort principle among them.
Knowing which rules come from the state and which from the plan tells you whether a plan’s position is negotiable or fixed, and that determines whether an escalation is worth making.
Common questions
- Does the state pay Medicaid claims?
- For most beneficiaries, no. Around 78% are in managed care plans run by commercial insurers, which pay the claims under contract with the state.
- Why does my Medicaid claim behave like a commercial claim?
- Because it is one. The managed care plan sets its own authorization rules, filing windows and appeal process within its state contract.
- How do I know which plan a Medicaid patient is in?
- Verify the plan, not just eligibility, at every visit. Patients move between plans and the card does not always make it obvious.
- Do I need a separate contract with each Medicaid plan?
- Usually yes. State enrollment is typically a prerequisite, and each managed care plan then credentials and contracts separately.
- Does fee-for-service Medicaid still exist?
- Yes, for a minority of beneficiaries and certain populations and services. It coexists with managed care rather than being replaced by it.
Denials Piling Up?
We handle the revenue cycle end to end — coding by certified coders, claim submission, denial management and appeals, and A/R follow-up, with six reported numbers every month.