Medicaid managed care organizations

A managed care organization (MCO) is a licensed health plan that contracts with a state Medicaid agency to deliver covered benefits to enrolled beneficiaries. Under a typical arrangement, the state pays the MCO a set amount per member per month — a model commonly called capitation — and the MCO assumes financial responsibility for arranging care within its network and paying provider claims. The state defines the scope of the contract, the covered populations, network adequacy expectations, and reporting requirements; the MCO operates within those terms.

Managed care is not a single uniform product. States use different program structures and may enroll different populations under different types of arrangements. Some benefits — behavioral health, dental, pharmacy, or long-term services and supports, for example — are sometimes "carved out" of the MCO contract and administered separately, while others are "carved in." What is carved in or out is a state-by-state decision that also changes over time, so the covered scope for any given member should be confirmed against current state and plan documentation rather than assumed.

In traditional fee-for-service Medicaid, the state (often through a fiscal agent) pays enrolled providers directly for each covered service. Under managed care, an intermediary plan sits between the provider and the state, and that plan generally sets the network rules, prior authorization requirements, and claim submission channels. The comparison below outlines common structural differences; specific practices are defined by each state and plan.

A single state often runs both models simultaneously — enrolling most beneficiaries in MCOs while keeping certain populations or services in fee-for-service. A deeper side-by-side is available in Fee-for-service vs. managed Medicaid.

Participating with Medicaid managed care generally involves two distinct steps. First, a provider completes Medicaid provider enrollment with the state program, which establishes the provider in the state's system. Second, the provider contracts and completes credentialing with each MCO whose members it intends to serve. Being enrolled with the state does not by itself make a provider in-network with any particular plan.

1. 01

   Enroll with the state Medicaid program

   Complete state provider enrollment so the provider and rendering NPIs are recognized. Requirements and screening levels are set by the state and CMS.
2. 02

   Contract and credential with each MCO

   Execute a participation agreement and complete credentialing with every plan whose members the provider will treat. Each MCO maintains its own network and timelines.
3. 03

   Confirm effective dates before billing

   Verify the plan-specific participation effective date; services rendered before that date may process differently or as out-of-network, depending on plan and state rules.

Once a provider is in-network, the MCO's provider manual governs day-to-day billing. Each plan defines which services require prior authorization, how requests are submitted, and how medical necessity is documented. Claims are submitted to the MCO (or its designated processor) rather than to the state fiscal agent, and the plan returns a remittance advice describing how each line was adjudicated.

• Standard professional and institutional claim formats — the CMS-1500 and UB-04 and their electronic equivalents — are generally used, but each MCO specifies its own submission channel and companion requirements.
• Timely filing deadlines are set by the plan and state contract; they may differ from fee-for-service Medicaid limits, so confirm each plan's window rather than assuming a single figure. See Medicaid timely filing.
• Prior authorization requirements, covered code sets, and documentation standards are plan-specific and change over time; consult the current MCO provider manual. See Medicaid prior authorization.
• When other coverage exists, coordination of benefits and Medicaid's role as payer of last resort still apply within managed care.

Denials under managed care are worked with the responsible plan, using that plan's appeal process. Because the adjudication rules and denial reasons are plan-specific, matching each denial to the correct MCO policy is essential. See Common Medicaid billing denials for recurring patterns.

Certain populations and benefits interact with managed care in specific ways. Some beneficiaries are dual-eligible, meaning they have both Medicare and Medicaid; how their Medicaid benefit is administered — including whether it runs through an MCO and how crossover claims flow — depends on the state and program. See Dual-eligible beneficiaries.

EPSDT within managed care

The EPSDT benefit for children is a federal Medicaid requirement, but its delivery is often administered through MCOs. How screening, diagnostic, and treatment services are authorized and billed follows the plan's rules within the federal framework.

CHIP and managed care

Coverage under CHIP is frequently delivered through managed care plans, and a state may use the same or different plans than it uses for Medicaid. Program design varies by state.

State program variation

Which populations are mandatorily enrolled, which are voluntary, and which remain in fee-for-service is a state policy decision that changes over time. See State Medicaid program variation.