Children's Health Insurance Program (CHIP): Eligibility and Enrollment

CHIP covers roughly 7 million children in the United States whose families earn too much to qualify for Medicaid but too little to comfortably afford private insurance — a gap that existed before 1997 and still shapes millions of enrollment decisions every year. This page explains how CHIP eligibility is determined, how enrollment works in practice, where the program fits relative to Medicaid and marketplace plans, and what happens at the edges where families fall into overlapping or uncertain coverage territory.

Definition and scope

CHIP — formally the Children's Health Insurance Program — was created by Title XXI of the Social Security Act in 1997 and is jointly funded by the federal government and individual states. The federal government sets baseline rules; states design and administer their own programs within those rules, which is why the program goes by different names in different places (Pennsylvania calls it CHIP, California calls it Medi-Cal for Kids, and so on).

The program targets children up to age 19 in families whose income falls above Medicaid limits but below a state-set ceiling, typically expressed as a percentage of the Federal Poverty Level (FPL). Most states set their CHIP income ceiling somewhere between 200% and 300% of the FPL, though some go higher — New York and California extend eligibility to 400% FPL for children, according to KFF's annual CHIP eligibility analysis. Pregnant women and, in some states, parents of CHIP-eligible children may also qualify, but children remain the core covered population.

Unlike private insurance, CHIP imposes no pre-existing condition exclusions and no waiting periods for medically necessary care. Premiums, if charged at all, are capped by federal law — families with income below 150% FPL pay no premiums, per 42 U.S.C. § 1397cc. Families navigating health insurance navigation for patients will find CHIP consistently ranks among the lowest out-of-pocket options available to uninsured children.

How it works

CHIP operates through two structural models, and states choose which to use — or combine both:

1. Medicaid expansion CHIP: The state expands Medicaid eligibility upward to cover children who would otherwise fall into the CHIP income band. Coverage rules, benefits, and cost-sharing mirror the state's Medicaid program.
2. Separate CHIP program: The state runs a standalone program with its own benefit package, cost-sharing structure, and enrollment rules. This model allows more design flexibility but also more variation in what families actually receive.
3. Combination programs: Roughly 20 states operate a hybrid, using Medicaid expansion for one income tier and a separate program for a higher tier.

Enrollment itself is handled at the state level, typically through the same application portal used for Medicaid. Since the Affordable Care Act, a single streamlined application submitted through HealthCare.gov or a state marketplace routes applicants to whichever program they qualify for — Medicaid, CHIP, or a subsidized marketplace plan. Children found eligible for CHIP who are enrolled through the marketplace must be transferred to CHIP, because CHIP coverage is generally more affordable and more comprehensive for that population.

Benefits covered under CHIP must include, at minimum: well-child visits, immunizations, inpatient and outpatient hospital care, mental health services, dental care, vision care, and prescription drugs. This benefit floor is set by federal statute, meaning a child cannot be enrolled in CHIP and denied a routine vaccination or dental exam as a coverage category — though prior authorization rules for specific services vary by state. Families dealing with prior authorization hurdles can find more context in the prior authorization patient guide.

Common scenarios

Scenario 1 — Income just above Medicaid, no employer insurance: A family of four earning $48,000 annually (roughly 175% FPL in 2024) is denied Medicaid for their children but qualifies for CHIP in virtually every state. Application through their state portal typically yields a coverage determination within 45 days; most states complete it faster.

Scenario 2 — Employer insurance available but unaffordable: Federal rules include a "cost-effectiveness test." If employer-sponsored family coverage costs more than it would cost CHIP to cover the child, the child may still qualify for CHIP even though employer coverage technically exists. This provision prevents the "family glitch" from automatically disqualifying children.

Scenario 3 — Undocumented children: Federal CHIP funds cannot cover undocumented immigrants, but states may use their own funds to do so. California extends Medi-Cal (its Medicaid/CHIP hybrid) to income-eligible children regardless of immigration status using state funding, per the California Department of Health Care Services.

Scenario 4 — Aging out at 19: A child turning 19 exits CHIP eligibility. Families navigating this transition — sometimes called the "aging out cliff" — should explore transitional care services and Medicaid young adult pathways before the birthday arrives, not after.

Decision boundaries

The key eligibility boundaries that determine CHIP access are worth understanding precisely, because small income changes can shift a child between Medicaid, CHIP, and marketplace plans — three programs with meaningfully different cost structures.

Children already enrolled in CHIP retain coverage during the plan year even if family income rises modestly — states conduct annual renewals, not continuous real-time income monitoring. The 12-month continuous eligibility standard, which most states have adopted, means a child enrolled in January stays enrolled through December regardless of interim income fluctuations.

Families uncertain whether a child belongs in CHIP or Medicaid can consult patient financial assistance programs resources, since both programs are part of a broader landscape of patient services for uninsured Americans. For children with complex or chronic conditions, understanding coverage continuity matters as much as initial enrollment — chronic disease management services coverage under CHIP follows the same federal benefit floor as Medicaid expansion programs, providing a stable baseline even when state supplemental benefits vary.