What Services Does Medicaid Cover

Medicaid is a joint federal-state health insurance program that funds a broad range of medical services for eligible low-income individuals, including children, pregnant women, adults, elderly individuals, and people with disabilities. Federal law establishes a floor of mandatory benefits that every state must cover, while states retain authority to add optional services beyond that baseline. Understanding what the program covers — and where coverage decisions diverge by state — is foundational to navigating enrollment, care planning, and appeals. A broader orientation to the program's structure is available on the Medicaid Authority homepage.

Definition and scope

Medicaid coverage is governed primarily by Title XIX of the Social Security Act (42 U.S.C. § 1396 et seq.), which establishes both mandatory and optional benefit categories. The Centers for Medicare & Medicaid Services (CMS) administers the program at the federal level and publishes the authoritative list of covered service categories at medicaid.gov.

Mandatory benefits — services all state Medicaid programs must cover — include:

1. Inpatient hospital services
2. Outpatient hospital services
3. Early and Periodic Screening, Diagnostic, and Treatment (EPSDT) services for individuals under age 21
4. Nursing facility services
5. Home health services
6. Physician services
7. Rural health clinic services
8. Federally Qualified Health Center (FQHC) services
9. Laboratory and X-ray services
10. Family planning services and supplies
11. Nurse midwife services
12. Certified pediatric and family nurse practitioner services
13. Freestanding birth center services
14. Transportation to medical care

Optional benefits that states may elect to cover include prescription drugs, dental care, vision services, physical therapy, occupational therapy, speech-language pathology, prosthetics, case management, and home- and community-based services (HCBS) under Medicaid waiver authority (CMS — Medicaid Benefits Overview).

As of the 2023 Medicaid Drug Rebate Program data, prescription drugs represent one of the largest optional benefit categories by expenditure, and 50 states and the District of Columbia have elected to cover them (Medicaid.gov — Prescription Drugs).

How it works

Coverage is delivered through two primary mechanisms: fee-for-service (FFS) and managed care. Under FFS, states pay providers directly for each covered service rendered. Under managed care, states contract with private health plans — Medicaid Managed Care Organizations (MCOs) — that receive a per-member per-month capitation rate and assume responsibility for coordinating covered services. As of 2023, more than 40 states use managed care as the primary delivery system for at least part of their Medicaid population (CMS — Medicaid Managed Care).

The EPSDT benefit for children under 21 is substantially broader than adult coverage. It requires states to provide any service that is medically necessary to treat a condition identified through screening, even if that service is not otherwise covered in the state's adult benefit plan. This creates a material distinction between pediatric and adult coverage in Medicaid.

For adults, the expansion of Medicaid under the Affordable Care Act (ACA) — codified at 42 U.S.C. § 1396a(a)(10)(A)(i)(VIII) — extended eligibility to individuals with incomes at or below 138 percent of the federal poverty level, and states that adopted expansion receive an enhanced federal matching rate. As of 2024, 40 states and the District of Columbia have adopted Medicaid expansion (KFF — Status of State Medicaid Expansion Decisions).

Common scenarios

Scenario 1: Child wellness and developmental services. A child enrolled in Medicaid who shows signs of developmental delay during a routine EPSDT screen is eligible for diagnostic testing and, if a condition is confirmed, all medically necessary treatments — including speech therapy and applied behavior analysis — regardless of whether those services appear in the state's standard optional benefit list.

Scenario 2: Long-term care for an elderly enrollee. An elderly individual who meets both financial and functional eligibility criteria may receive nursing facility services as a mandatory benefit. Alternatively, if the state operates an HCBS waiver under Section 1915(c) of the Social Security Act, the individual may receive equivalent care at home or in a community setting, which states have increasingly adopted to reduce institutional costs.

Scenario 3: Behavioral health and substance use treatment. Following the Substance Use-Disorder Prevention that Promotes Opioid Recovery and Treatment (SUPPORT) Act of 2018, states are required to cover medication-assisted treatment (MAT) for opioid use disorder, including buprenorphine and methadone, as a mandatory benefit through at least 2025 (CMS — SUPPORT Act).

Decision boundaries

Coverage determinations hinge on three principal questions: whether a service falls within a mandatory or optional category, whether the state has elected and funded the optional service, and whether the service is deemed medically necessary for a specific enrollee.

Mandatory vs. optional: A state cannot refuse to cover a mandatory benefit for any eligible enrollee. An optional benefit, by contrast, exists only if the state has included it in its approved State Plan.

Medical necessity: Even for covered service categories, individual claims are subject to medical necessity review. States define medical necessity criteria in their State Plans and managed care contracts. Denials based on medical necessity can be appealed through the state's fair hearing process, a right guaranteed under 42 C.F.R. § 431.220 (eCFR — 42 C.F.R. Part 431).

Waiver authority: Home- and community-based services, behavioral health carve-outs, and certain demonstration programs operate under waiver authority (Sections 1115, 1915(b), and 1915(c) of the Social Security Act). Benefits delivered through waivers are not guaranteed statewide and may be subject to enrollment caps or waiting lists, unlike standard plan services.

Beneficiaries seeking to understand which specific services apply to their circumstances should consult their state Medicaid agency directly. Additional dimensions of program structure — including eligibility categories and income thresholds — are detailed on the key dimensions and scopes of Medicaid page, and answers to common questions are compiled in the Medicaid frequently asked questions resource.

References

• 42 U.S.C. § 1396 et seq.
• medicaid.gov
• Medicaid.gov — Prescription Drugs
• CMS — Medicaid Managed Care
• KFF — Status of State Medicaid Expansion Decisions
• CMS — SUPPORT Act
• eCFR — 42 C.F.R. Part 431