> ## Documentation Index
> Fetch the complete documentation index at: https://mso.getlemma.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Medicaid

> State Medicaid programs: why it's 50+ separate programs, the two-layer enrollment structure, screening levels, and the economics question.

**Medicaid is not one program.** It is a federal-state partnership implemented as 50+ distinct state programs, each with its own eligibility rules, covered services, fee schedules, enrollment process, and revalidation cycle. Nothing about Medicaid transfers between states.

**Payer content ages fastest of anything on this site.** Portals move, forms change, payer IDs get reassigned, and **timely filing limits are contract-specific regardless of what any table says**. Treat this page as orientation; the payer's own current documentation and **your executed contract** are authoritative. **Checked August 2026.**

## The structure

| Layer                                 | What it is                                                                                   |
| ------------------------------------- | -------------------------------------------------------------------------------------------- |
| **State Medicaid agency**             | Administers the program; you must enroll here to serve beneficiaries at all                  |
| **Managed care organizations (MCOs)** | Where most beneficiaries actually are. **Each requires its own contract and credentialing.** |
| **Fee-for-service Medicaid**          | A minority of beneficiaries in most states                                                   |

**State agency enrollment is necessary but rarely sufficient.** A state with five Medicaid MCOs is **six enrollments**. A group that enrolls with the state and stops will find most Medicaid patients out of network.

## The major MCO operators

**Centene** (state-specific brands), **Molina**, the national carriers' Medicaid arms (Aetna Better Health, Anthem/Wellpoint, UnitedHealthcare Community Plan), and regional nonprofits.

## Enrollment

<Steps>
  <Step title="Find the state agency's provider enrollment portal">
    Start at [medicaid.gov state overviews](https://www.medicaid.gov/state-overviews/index.html).
  </Step>

  <Step title="Complete state enrollment">
    Including ownership and control disclosure — which should be **consistent with your Medicare 855B disclosure**.
  </Step>

  <Step title="Expect a screening level, and possibly a site visit">
    Federal rules require states to screen enrolling providers at **limited, moderate, or high** risk levels, with escalating requirements. Moderate and high can include unannounced site visits; high can include fingerprint-based background checks for owners.<sup>[1](#sources)</sup>
  </Step>

  <Step title="Contract and credential with every MCO in your service area">
    Check whether the state uses a single credentialing verification organization — it materially reduces the work.
  </Step>
</Steps>

**Timeline: 60–180 days for state enrollment**, plus 90–180 days per MCO, often in parallel. Frequently the longest pole in a new state.

## Timely filing

State-specific — commonly anywhere from 90 days to 12 months, and MCO limits are contractual. Record each.

## Appeals

Plan appeal (for MCOs), then the **state fair hearing** process. Medicaid appeal rights are governed by state and federal Medicaid regulation and differ from commercial appeals.

## Revalidation

At least every five years, state-specific. Missing it means termination and claims stopping.

## The economics question

**Whether to take Medicaid at all is a real business decision, and it is defensible either way.**

**For:** access mission, patient volume, network adequacy leverage with the state, and in some markets a large share of the population.

**Against:** rates are generally the lowest of any payer, administrative burden is the highest, and the enrollment investment is substantial.

Model contribution margin per Medicaid visit **including administrative cost** before committing. Make it a decision rather than a default.

## The 60-day rule applies

Medicaid overpayments are subject to the same **60-day report-and-return obligation** as Medicare. See [Report and return overpayments](/guides/compliance/report-and-return-overpayments).

## Sources

1. Provider screening requirements: 42 C.F.R. §§ 455.410–455.470. CMS, [Medicaid Provider Enrollment](https://www.medicaid.gov/medicaid/program-integrity/provider-enrollment/index.html).


## Related topics

- [The US payer landscape](/concepts/payments/the-payer-landscape.md)
- [Payers vs insurance companies (they're not synonyms)](/concepts/payments/payers-vs-insurance-companies.md)
- [Enroll and contract with commercial payers](/guides/enrollment/enroll-with-commercial-payers.md)
- [Set up EDI, ERA, and EFT with each payer](/guides/enrollment/set-up-edi-era-eft.md)
- [File appeals](/guides/billing/file-appeals.md)
- [How to use the payer reference](/reference/payers/overview.md)
- [Payer enrollment & submission links](/reference/payers/enrollment-links.md)
- [Timely filing limits by payer](/reference/payers/timely-filing-limits.md)