Medicaid claims are processed by whichever entity is financially responsible for the patient’s care: for most beneficiaries today, that’s a private managed care organization contracted by the state; for beneficiaries in traditional fee-for-service Medicaid, it’s the state Medicaid agency, almost always through a private fiscal agent that operates the state’s claims processing system. The state agency is legally accountable in every case, but the day-to-day work of receiving, checking, and paying claims sits with an MCO or a vendor.
The State Medicaid Agency Is Legally Responsible
Federal law requires each state to designate a single agency to administer its Medicaid program. Section 1902(a)(5) of the Social Security Act establishes that requirement, and it means one state entity — a department of health, human services, or medical assistance, depending on the state — either runs Medicaid directly or supervises everyone who does.1Social Security Administration. Social Security Act 1902
That agency sets eligibility rules, decides which services the state covers, establishes provider payment rates, and pays claims from providers who treat beneficiaries in the traditional fee-for-service model. In fee-for-service Medicaid, the state pays the provider directly for each covered service. Even when the state delegates the mechanical work to a contractor or hands enrollees off to a managed care plan, accountability for accurate and timely payment stays with the state agency, which answers to CMS and to beneficiaries.
Managed Care Organizations Process Most Claims
More than three-quarters of Medicaid beneficiaries are enrolled in managed care, and their claims never reach the state’s own system. The state pays each managed care organization a fixed monthly capitation payment per enrolled member, and the MCO takes on responsibility for arranging and paying for that member’s care.2Medicaid.gov. Managed Care When a provider treats an MCO enrollee, the claim goes to the MCO.
MCOs build their own provider networks, operate their own claims adjudication systems, and make coverage decisions for their members. They aren’t free to design coverage from scratch, though. Federal regulations require MCOs to cover services in an amount and scope at least equal to what the state’s fee-for-service program provides, and they can only limit services based on criteria such as medical necessity.3eCFR. 42 CFR 438.210 – Coverage and Authorization of Services
For providers, this creates a practical reality: a hospital that treats two Medicaid patients on the same day might send one claim to the state’s fee-for-service processor and another to a private MCO, each with its own submission format, timing rules, and prior authorization requirements. The state Medicaid card alone doesn’t tell you where the claim goes; the patient’s specific plan enrollment does.
Fiscal Agents and the Medicaid Management Information System
Most states don’t run their claims processing technology in-house. They contract with private-sector vendors — commonly called fiscal agents — to operate the Medicaid Management Information System, the federally required platform that receives claims, checks eligibility, applies pricing rules, and issues payment.4Medicaid.gov. Medicaid Management Information System Section 1903(a)(3) of the Social Security Act provides enhanced federal matching funds, including 90 percent match during design and development, specifically to help states build and maintain these systems.5Social Security Administration. Social Security Act 1903 – Payment to States
An MMIS does far more than move paper. When a claim comes in, the system verifies the beneficiary was eligible on the date of service, confirms the provider is enrolled with Medicaid, checks that the service is covered, applies the state’s fee schedule, and screens for coding problems. CMS requires every state to apply National Correct Coding Initiative edits when adjudicating Medicaid claims, including procedure-to-procedure edits that catch unbundled services and medically unlikely edits that flag implausible billing quantities.6Centers for Medicare & Medicaid Services. Medicaid NCCI Edit Files All of this happens automatically before a human reviewer sees the claim.
MCOs run comparable systems for their own enrollees, either operated internally or run by third-party administrators under contract. Whoever operates the technology, the contracting entity — state agency or MCO — remains responsible for the accuracy of what comes out of it.
CMS Regulates, But Does Not Process Claims
The Centers for Medicare & Medicaid Services oversees every state Medicaid program but does not touch individual claims. CMS writes the federal rules states have to follow, reviews and approves state plan amendments, manages federal budget and expenditure reporting, and issues the quarterly grant awards that fund the federal share of Medicaid costs.7Medicaid.gov. Center for Medicaid and CHIP Services It also helps finance and certify the state MMIS platforms.
Enforcement runs through the money. CMS conditions federal matching funds on state compliance with Title XIX of the Social Security Act, and when a state or MCO pays a claim improperly, CMS can recoup the federal share.5Social Security Administration. Social Security Act 1903 – Payment to States If you’re a provider or a beneficiary trying to resolve a claim problem, CMS is not the entity to call. The state agency, or the MCO that made the decision, is.
How to Tell Which Entity Processes a Given Claim
The processor follows the patient’s enrollment. If the beneficiary is enrolled in a Medicaid managed care plan, the claim goes to that plan, and the plan’s provider manual governs submission format, prior authorization, and appeals. If the beneficiary is in fee-for-service Medicaid, the claim goes to the state’s MMIS, operated by the state agency or its fiscal agent, under the state’s Medicaid provider manual.
Providers who treat Medicaid patients across multiple plans deal with different rules for each one, and mismatched rules are among the most common sources of claim denials in managed care. Checking eligibility and plan enrollment before submitting — not just Medicaid eligibility in general — is how most of those denials get avoided.
Filing and Payment Deadlines
Federal regulations set the outer limits on both sides of the transaction. Providers must submit claims no later than 12 months from the date of service.8eCFR. 42 CFR 447.45 – Timely Claims Payment Many states impose shorter windows, often 90 to 180 days, and MCOs commonly set their own filing deadlines in provider contracts. Miss the window and the provider absorbs the cost.
On the payment side, state Medicaid agencies must pay at least 90 percent of clean claims from practitioners within 30 days of receipt, and 99 percent within 90 days.8eCFR. 42 CFR 447.45 – Timely Claims Payment A clean claim is one the system can process without asking the provider or a third party for more information. Claims under fraud investigation or medical necessity review don’t count, and those deadlines don’t apply to them. For claims outside the practitioner category, including hospital and facility claims, states have up to 12 months from receipt to pay.