South Carolina Medicaid After SSI: Section 1634, TEFRA, and Keeping Coverage at 18

SSI and Medicaid Are Linked in South Carolina

South Carolina is a Section 1634 state. Under its agreement with the Social Security Administration, an individual approved for SSI is automatically enrolled in Healthy Connections Medicaid — no separate state application required. The SSA transmits eligibility records directly to the state Medicaid agency, which issues the Medicaid card.

For most families, this means the question "does SSI qualify for Medicaid in South Carolina?" has a simple answer: yes, automatically. There is no additional state Medicaid application or separate state income evaluation for the SSI-linked pathway.

But the automatic link also means that anything that disrupts SSI eligibility can threaten Medicaid coverage. The age-18 transition creates several situations where that disruption is a real risk.

What Happens to Medicaid at 18

When a child receiving SSI turns 18, two things happen simultaneously:

Parental deeming ends. The SSA stops counting parental income and assets. If the family's income previously made the child ineligible for SSI, the young adult may now qualify on their own — with the individual resource limit at $2,000 and the 2026 Federal Benefit Rate at $994 per month. This can actually expand eligibility.

The age-18 redetermination begins. Within the year after the 18th birthday, SSA reviews the case under adult disability standards. If the redetermination confirms eligibility, SSI continues and Medicaid stays in place. If the redetermination results in a cessation, SSI payments end after two additional months — and Medicaid becomes vulnerable.

The TEFRA Cliff at Age 19

For families whose children qualified for Medicaid through TEFRA (the Katie Beckett option) rather than SSI, age 19 is the critical boundary. TEFRA Medicaid covers children with disabilities regardless of parental income, but eligibility terminates at 19 in South Carolina.

This creates a gap: the child ages out of TEFRA at 19, and if the adult SSI application is still pending or has been denied, there is no automatic Medicaid pathway. The family must apply for an alternative Medicaid category through Healthy Connections to prevent a coverage break.

The timing pressure is real. Families relying on TEFRA should submit the adult SSI application at age 18 and pursue an alternative Medicaid category before TEFRA coverage ends at 19.

If SSI Is Denied at the Redetermination

An SSI denial doesn't immediately terminate Medicaid — but it starts a countdown. Once SSI payments end (two months after the cessation notice), the Section 1634 link breaks, and the state Medicaid agency must independently evaluate whether the individual qualifies under any other pathway.

South Carolina administrators are required to review the file for alternative Medicaid categories before terminating coverage. But families should not rely on this happening automatically. Proactive steps to take immediately after a denial:

• File the SSI appeal within 10 calendar days to trigger Statutory Benefit Continuation. Under SBC, both SSI and Medicaid continue uninterrupted during the appeal.
• Contact the Healthy Connections Member Help Center at 1-888-549-0820 to confirm the alternative Medicaid review is underway
• Apply separately for Medicaid through apply.scdhhs.gov if no other pathway is identified, and ask SCDHHS which alternative category applies

Medicaid for Waiver Services

Healthy Connections Medicaid is a prerequisite for HCBS waiver enrollment. The ID/RD Waiver and Community Supports Waiver both require the individual to be Medicaid-eligible. Losing Medicaid doesn't just mean losing healthcare coverage — it can jeopardize a waiver slot that took years of waiting to obtain.

For waiver-eligible individuals, the income threshold is higher than standard Medicaid: South Carolina applies a gross monthly income limit equal to 300% of the SSI Federal Benefit Rate, which is $2,982 per month in 2026. Individuals whose income exceeds this limit can establish a Miller Trust (Qualified Income Trust) — an irrevocable trust that deposits monthly income and pays allowable expenses — to meet the requirement.

Medicaid Protection When Transitioning to DAC

When a disabled adult child transitions from SSI to Disabled Adult Child benefits based on a parent's Social Security record, the higher DAC payment often pushes income above the SSI threshold. SSI stops, and the Section 1634 link would normally break.

Federal law prevents this: DAC beneficiaries who lose SSI solely because of the DAC transition are protected from losing Medicaid. But the family must provide the SSA award letter to the state Medicaid agency and explicitly request that the protection be applied. Without that documentation, the Medicaid caseworker may process a standard termination.

What to Do If the Medicaid Card Never Arrives

Under the Section 1634 agreement, SSI approval should trigger automatic Medicaid enrollment. But administrative delays happen. If a young adult receives SSI approval but no Medicaid card arrives, contact the Healthy Connections Member Help Center at 1-888-549-0820 with the SSI approval letter in hand.

The South Carolina SSI at 18 & Adult Disability Benefits Guide maps every Medicaid pathway available during the transition — Section 1634, TEFRA wind-down, waiver-linked Medicaid, and the DAC protection rule — with a timeline showing when each pathway opens and closes.

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