South Carolina Power of Attorney for Disability — Medical Decisions at Age 18

Why Medical Authority Changes at 18

South Carolina law presumes that every person who turns 18 has full capacity to make their own medical decisions. This is true regardless of disability status. A parent who has managed their child's healthcare appointments, medication, therapy, and hospital visits for 18 years loses all legal authority to do so overnight — unless they've put a legal instrument in place beforehand.

Hospitals, physicians, and pharmacies take this seriously. They generally need the patient's authorization before sharing medical information with a parent once the patient turns 18, unless an authorized representative or another applicable exception applies. The result: a parent who calls to refill their adult child's medication or discuss treatment options with a doctor can be told, legally and correctly, that they need written authorization.

Healthcare Power of Attorney: The Primary Tool

If the young adult has the cognitive capacity to understand what a power of attorney is — that they are naming someone to make medical decisions on their behalf — a Healthcare Power of Attorney (HCPOA) is the most straightforward solution.

The HCPOA names a parent or other trusted adult as the "agent" for medical decisions. It typically includes a built-in HIPAA release, giving the agent legal authority to access medical records, discuss treatment options with providers, and make healthcare decisions when the young adult is temporarily or permanently unable to do so.

The young adult can define the scope of the HCPOA. It can be broad (covering all medical decisions) or limited (covering only specific situations, like emergency care or psychiatric treatment). It can also specify when it takes effect — immediately, or only when the young adult is determined to be unable to consent.

To execute an HCPOA in South Carolina, the young adult must sign the document in the presence of two witnesses. Having it notarized is strongly recommended, though not strictly required for the healthcare power of attorney itself. Many families execute the HCPOA on or shortly after the young adult's 18th birthday.

The Adult Health Care Consent Act: The Safety Net

Not every young adult with a disability has the capacity to execute a power of attorney. For those who cannot, South Carolina's Adult Health Care Consent Act (S.C. Code § 44-66-30) provides an alternative that does not require probate court.

The Act establishes a statutory hierarchy of people who are authorized to make medical decisions when two physicians determine that the patient is unable to give informed consent. The priority order:

1. A court-appointed guardian (if one exists)
2. An attorney-in-fact designated under a healthcare power of attorney
3. A spouse
4. An adult child of the patient
5. A parent of the patient
6. An adult sibling of the patient
7. A grandparent of the patient
8. Any other adult relative by blood or marriage with a close personal relationship to the patient
9. A person given authority to make health care decisions for the patient under another statute
10. If persons 1 through 9 are unavailable, an adult with an established relationship to the patient who is acting in good faith, can reliably convey the patient's wishes, and is not a paid caregiver or health care provider

For many families of young adults with disabilities, a parent falls at position 5 — if no person higher on the list is available, they can make medical decisions without guardianship, without a power of attorney, and without any court filing, as long as two physicians have determined the young adult cannot consent.

The limitation is that this authority applies only while the patient is unable to consent, subject to the Act's rules for temporary inability. If the young adult regains the ability to consent, their own decisions govern.

When Guardianship Is Not Needed for Medical Decisions

Families are sometimes told by well-meaning professionals that they must pursue guardianship through probate court to continue managing their adult child's medical care. In most cases, this is not accurate.

Between the HCPOA (for young adults with capacity to sign one) and the Adult Health Care Consent Act (for those without), South Carolina provides two pathways that cover medical decision-making without the cost, time, and rights restrictions of guardianship.

Guardianship for medical purposes is typically necessary only when neither pathway works — for example, when the young adult lacks capacity to sign an HCPOA, the statutory hierarchy does not include a suitable decision-maker (rare for families with involved parents), or a provider refuses to honor the statutory hierarchy without a court order (which families can challenge).

Separate HIPAA Releases Still Matter

Even with an HCPOA in place, it's good practice for the young adult to sign standalone HIPAA authorization forms at each medical provider they see. Some providers accept the HCPOA's built-in HIPAA release; others require their own form. Having both eliminates any ambiguity at the front desk.

If the young adult cannot sign a HIPAA release independently, the HCPOA agent can sign it on their behalf. For families using the Adult Health Care Consent Act pathway, the person with statutory authority can typically request records as part of making treatment decisions, though providers may require documentation of the two-physician determination.

Coordinating Medical Authority With Other Transition Decisions

Medical decision-making is one piece of the puzzle. Families approaching the 18th birthday often need to address educational decisions (through the South Carolina Educational Consent Act), financial management (through representative payee arrangements for SSI or a financial power of attorney), and broader life decisions (through supported decision-making agreements).

Each of these uses a different legal instrument, and none of them requires guardianship. The South Carolina IEP Transition to Adulthood Guide walks through each instrument with a timeline showing when to prepare each one, who signs what, and how they work together to support the young adult's autonomy while ensuring nothing falls through the cracks.

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