Delaware Medicaid Age-18 Redetermination for Youth With Disabilities

Why Age 18 Changes Everything for Medicaid

For Lifespan Waiver-related Medicaid eligibility, when your child turns 18, parental income is disregarded and the redetermination evaluates your now-adult child as an individual — their income and assets. For many families who earned too much to qualify their child under family-based Medicaid, the 18th birthday opens a door that was previously shut.

This shift matters enormously for transition planning because Medicaid eligibility is the funding mechanism behind the DDDS Lifespan Waiver, which pays for supported employment, residential services, remote supports, and other community-based services your child may need after high school.

How Redetermination Works in Delaware

Delaware uses the ASSIST portal for all Medicaid applications and renewals. Families should not assume that the right adult pathway will be initiated automatically when their child approaches 18. Waiting passively risks a gap in coverage.

The proactive approach: start the adult Medicaid application process through ASSIST while your child is still enrolled in school and confirm the filing timing with DHSS. This runs parallel to the existing coverage and helps coordinate the transition from child Medicaid to adult Medicaid. For Lifespan Waiver-related eligibility, the young adult is evaluated using individual income and asset rules.

For young adults with disabilities, SSI-linked Medicaid is one relevant eligibility pathway. If your child qualifies for Supplemental Security Income at age 18 — which uses individual income and asset rules — ask DHSS how Medicaid enrollment will be handled; the Medicaid application remains a separate step for Lifespan Waiver funding. The SSI resource limit is $2,000 in countable assets (with significant exclusions, including up to $100,000 in an ABLE account).

The Connection to DDDS and Waiver Services

DDDS eligibility and Medicaid eligibility are separate determinations that must both be in place for waiver services. DDDS confirms the developmental disability diagnosis and functional limitations. Medicaid confirms financial eligibility and funds the actual services through the 1915(c) Lifespan Waiver.

This is where families often hit an unexpected wall: they complete the DDDS application and get approved, then discover that waiver services can't start because the Medicaid application is still pending. The fix is filing both simultaneously — DDDS intake and Medicaid through ASSIST — during the junior or senior year of high school.

What to Watch For

Don't assume automatic enrollment. Delaware's Medicaid system processes redeterminations on a schedule, but transition-age youth with disabilities can fall through the cracks if the system doesn't flag them for the disability-based pathway.

SSI application timing matters. Apply for adult SSI at age 18. SSA evaluates disability differently for adults than for children — the childhood standard asks whether the condition causes "marked and severe functional limitations," while the adult standard asks whether the person can perform substantial gainful activity. Some conditions that qualified under the childhood standard may require additional documentation under the adult standard.

ABLE accounts protect eligibility. If your young adult has savings, an ABLE account excludes up to $100,000 from SSI's countable resource limit. Contributions are capped at $20,000 per year (standard) plus an additional $15,650 for employed individuals under the ABLE-to-Work provision, which was made permanent by the One Big Beautiful Bill Act in 2025. The ABLE age-of-onset threshold expanded from 26 to 46 in January 2026.

The Delaware IEP Transition to Adulthood Guide includes a financial planning timeline that coordinates the SSI application, Medicaid redetermination, and ABLE account setup so nothing slips through during the transition year.

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