Medicaid for Children and the CHIP Program

Medicaid and the Children's Health Insurance Program (CHIP) together form the primary public coverage framework for low- and moderate-income children in the United States, insuring more than 40 million children as documented by the Centers for Medicare & Medicaid Services (CMS). This page explains how both programs are structured, who qualifies, how coverage is delivered, and where the two programs diverge in eligibility and benefit design. Understanding the distinction between Medicaid and CHIP is essential for families, navigators, and administrators who must route applicants to the correct program. For a broader orientation to Medicaid's overall structure, the Medicaid Authority home page provides additional context.

Definition and scope

Medicaid for children is the mandatory coverage pathway established under Title XIX of the Social Security Act, requiring states to cover children in families with incomes at or below specified federal poverty level (FPL) thresholds. All 50 states and the District of Columbia operate Medicaid programs under federal-state partnership agreements with CMS.

CHIP, authorized under Title XXI of the Social Security Act, was created by the Balanced Budget Act of 1997 to extend coverage to children in families whose incomes exceed Medicaid limits but remain too low to afford private insurance. States may operate CHIP as:

Federal law sets a minimum Medicaid income eligibility floor for children: children ages 6–18 must be covered up to 100% FPL, while children under age 6 must be covered up to 133% FPL (42 U.S.C. § 1396a(a)(10)(A)(i)). CHIP typically covers children in families earning between 100% and 200% FPL, though states may set higher upper limits — some states extend CHIP eligibility to 300% or 400% FPL.

How it works

Both programs are administered at the state level within federal parameters. Enrollment, renewal, and benefit delivery follow a structured sequence:

  1. Application — Families apply through the state Medicaid agency, HealthCare.gov, or a state marketplace. A single streamlined application determines eligibility for both Medicaid and CHIP.
  2. Income and residency verification — States verify household income against the FPL, using modified adjusted gross income (MAGI) methodology as required by the Affordable Care Act.
  3. Eligibility determination — Children found eligible for Medicaid are enrolled in Title XIX coverage. Children above the Medicaid income threshold but within CHIP limits are routed to Title XXI coverage.
  4. Coverage assignment — Children receive a benefits package that includes mandatory services such as inpatient and outpatient hospital services, physician services, laboratory and X-ray services, and all services covered under the Early and Periodic Screening, Diagnostic, and Treatment (EPSDT) benefit for Medicaid-enrolled children.
  5. Renewal — Eligibility is redetermined annually. States must provide a 12-month continuous eligibility period before initiating redetermination for children under CHIP.

A key structural difference: Medicaid carries no cost-sharing requirement for children in most benefit categories, while CHIP programs may charge modest premiums and copayments scaled to family income, subject to a 5% of annual family income aggregate cap (42 U.S.C. § 1397cc(e)).

The federal match rate also differs. Medicaid uses the Federal Medical Assistance Percentage (FMAP), which varies by state wealth. CHIP uses an enhanced FMAP (eFMAP) that adds 15 percentage points to the standard FMAP rate, resulting in higher federal contributions for CHIP expenditures (CMS FMAP information).

Common scenarios

Newborn coverage — When a Medicaid-enrolled mother delivers a child, the newborn is automatically deemed eligible for Medicaid for at least 12 months without a separate application, under deemed newborn provisions in federal statute.

Child aging out of dependent status — Children enrolled in CHIP lose eligibility at age 19. At that point, they must apply for adult Medicaid coverage (if income-eligible) or seek marketplace coverage. The Medicaid frequently asked questions page addresses age transition scenarios in detail.

Income fluctuation — A family earning 190% FPL whose income rises to 210% FPL may shift from CHIP eligibility to ineligibility, depending on state upper limits. The reverse — a family dropping from 210% to 150% FPL — may trigger a switch from private coverage to CHIP.

Children with disabilities — Children who qualify for Supplemental Security Income (SSI) are automatically eligible for Medicaid in most states, regardless of family income, providing a separate pathway from the standard MAGI-based rules.

Foster care children — Under the Fostering Connections Act provisions incorporated into the ACA, former foster children who were enrolled in Medicaid at age 18 retain Medicaid eligibility until age 26, regardless of income.

Decision boundaries

Distinguishing which program applies to a child requires evaluating four variables in order:

  1. Age — Children from birth through 18 are the primary target population. Children under 6 face a lower income eligibility floor under Medicaid than children 6–18.
  2. Income relative to FPL — Medicaid covers lower-income children; CHIP covers the income band above Medicaid's upper limit up to the state's CHIP ceiling.
  3. Immigration status — Lawfully residing children became eligible for Medicaid and CHIP without a 5-year waiting period under the Children's Health Insurance Program Reauthorization Act of 2009 (CHIPRA) (CMS CHIPRA overview). Undocumented children do not qualify for federal Medicaid, though some states use state-only funds to provide limited coverage.
  4. State-specific program design — States with Medicaid expansion CHIP programs enroll income-eligible children directly into Medicaid, eliminating a structural distinction at the benefit level. States with stand-alone CHIP programs maintain separate benefit packages that may differ from Medicaid in scope.

Families uncertain about which program applies to a specific child can begin the process through How to Get Help for Medicaid, which outlines the application channels available by state. The key dimensions and scopes of Medicaid page addresses how income eligibility categories interact across the full Medicaid program.

References

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