The short version
- A parent or legal guardian consents for a child until the age of majority — 18 in most states. Being present, related or paying the bill is not authority.
- For separated parents, the custody order decides. Legal custody is the right to make medical decisions; physical custody is only where the child sleeps.
- A signed authorisation lets a grandparent, camp or school consent, but it is delegated authority: a parent who is reachable and says no overrides it.
- Every state lets minors consent to STI testing and treatment on their own, and where a minor lawfully consents, the parent usually stops being the person entitled to those records.
Authority follows the paperwork, not the person in the room
Consent to treat a child is given by a parent or legal guardian until the child reaches the age of majority, 18 in most states. Treatment without valid consent is in principle a battery, and in practice a licensing and insurance problem for the clinician — which is why front-desk staff ask who you are.
Everything after that sentence varies. Whether a step-parent has authority, whether an unmarried father does, whether the grandmother the child lives with does, and whether the child holds any of their own are questions of state law — and often of a court order nobody has given the practice.
How much authority each adult actually holds
Parent or legal guardian
Delegated caregiver
Adult present, no paper
Separated parents: the order decides, not who turns up
The distinction that matters is between legal custody and physical custody. Legal custody is the right to make decisions about health, education and welfare; physical custody is where the child lives. A parent can have the child half of every month and no authority to authorise a tonsillectomy, because the two are decided in different paragraphs of the same order.
Where legal custody is joint, the common default is that either parent may consent alone. But orders often carve out categories needing both — surgery, psychiatric treatment, anything elective — and many practices apply a stricter rule than the order requires, because the practice is the party that gets sued when a parent objects afterwards.
Handing the authority to a grandparent, a camp or a school
A parent can delegate the power to consent. What the delegation is called and how far it reaches is set by state statute, and the two common shapes behave differently.
- A caregiver authorisation. Several states publish a statutory form. California's caregiver's authorization affidavit lets an adult the child lives with enrol them in school and consent to school-related care; a relative caregiver completing the whole form gets a guardian's rights to authorise medical and dental treatment.
- A statutory list of who may consent when the parent cannot be reached. Texas names grandparents, adult siblings, adult aunts and uncles, schools and adults with actual care of the child — but only where the parent cannot be contacted and has not given notice to the contrary.
Both share a limit people miss. Delegated authority is subordinate, not substitute — the California statute says expressly that a caregiver's decision is superseded by a contravening decision of the parent. A signed letter lets the holder act when the parent is unreachable. It does not let them act against a parent on the phone saying no.
What makes a consent letter usable at a front desk
- The child's full name and date of birth, and the signing parent's relationship and authority to sign.
- The named adult who may consent, plus a second name as a fallback.
- The scope: routine and emergency care, or something narrower — a single procedure, a named condition.
- The dates it runs between. An open-ended letter draws more suspicion than one that expires.
- Known allergies, current medication, the treating physician, the insurer.
- Express permission for the named adult to be told what the doctor found — a separate grant from the power to consent.
- A signature, and notarisation where the state form calls for it or the trip is international.
Child medical consent letter
Who may consent, for what, and for how long — full text on the page. Pair it with a [medical authorization](/templates/personal-family/medical-authorization) where the carer also needs to be told what the doctor found.
Travel gives a second reason to carry one. Where a child crosses a border with one parent or another adult, US guidance is that the accompanying adult should hold a letter of consent from the absent parent, in English and preferably notarised. That letter is aimed at immigration officers rather than clinicians, and one document can do both jobs.
The emergency exception is real and narrower than people assume
Where delay would endanger the child, treatment proceeds without consent. The doctrine is implied consent: the law assumes a reasonable parent, knowing the situation, would agree. It is not a licence to treat any child whose parents are hard to reach.
What the emergency exception covers
Would delay in treating risk the child's life or serious harm?
Yes
Treat now, as far as the immediate threat requires. Keep trying to reach a parent, and record every attempt.
No
Find the person with authority, the written authorisation, or a statute letting the child consent. Waiting is the lawful option.
Two consequences follow. The exception reaches only as far as the emergency does, so it covers stabilising a fracture and not the elective follow-up. And it says nothing about payment: a department that treats without consent still bills, and who authorised the care is a separate question from who owes for it.
When the child holds the authority: mature and emancipated minors
Two doctrines move authority to the minor themselves, and they work very differently.
| Route | How it is established | What it covers |
|---|---|---|
| Emancipation | A court order, or a status the statute treats as emancipating — marriage, military service, self-supporting independent living | Adult decision-making, and adult responsibility for the bill |
| Mature minor | A clinician's judgement that this minor understands the risks, benefits and alternatives — recognised in a minority of states | The decision in front of the clinician, not a general status |
| Condition-based statute | The legislature has said minors may consent to a named category of care | That category only, sometimes above a stated age |
The mature-minor doctrine is a poor thing to rely on. It is judge-made in most places, unevenly recognised, and it can be legislated away: Tennessee, whose Supreme Court produced the best-known version, passed a statute in 2023 requiring parental consent for a minor's immunisations. A doctrine a legislature can narrow in one session is not a plan.
The categories many states let a minor consent to alone
The workable route is statutory, and organised by type of care rather than by the child. The reasoning is public health rather than autonomy: care adolescents will not seek if a parent must be told is care that does not happen.
Who consents to what
Parent consents
- Routine treatment
- Surgery
- Most immunisations
- Dental and orthodontic
Depends on the state
- Contraception
- Mental health care
- Substance use treatment
- Prenatal care
Minor may consent
- STI testing and treatment
- HIV testing in most states
STI care is the settled point: every state and the District of Columbia let minors consent to testing and treatment for sexually transmitted infections. Even there the detail moves — a handful set a minimum age, commonly 12 or 14, and about a third have provisions permitting, or in narrow circumstances requiring, the clinician to tell a parent. Contraception, mental health, substance use and prenatal care are each a separate map.
Consent and the records travel together
This is the part that surprises parents most, and it is a direct consequence of the rules above rather than a separate policy. Under the HIPAA privacy rule a parent is normally the minor's personal representative and can see the records. That stops in three situations: where the minor consented to the care and no other consent was required by law; where the minor could lawfully obtain the care without a parent and someone else authorised by law consented; and where the parent has agreed to a confidentiality arrangement between the minor and the provider.
Even then the rule does not decide access on its own. It hands the question back to state law: the provider may disclose where state law permits or requires it, must not where state law prohibits it, and where the state is silent, a licensed clinician exercises professional discretion. The same visit can be visible to a parent in one state and sealed in the next. HIPAA authorisation and a records release are the forms that move the information once someone decides it may move.
The document you need already exists before the emergency
Every question in this article is answered by a document that has to exist in advance — the custody order, the signed authorisation, the registration form the practice holds. None of them can be produced in a waiting room, and the moment they are needed is exactly the moment nobody is in a position to draft one.
Which makes it cheap to get right. A parent leaving a child with a relative for a fortnight writes one letter naming the carer, the scope and the dates. A separated parent hands over two highlighted pages. Both take twenty minutes, and both are the difference between treatment happening and a phone call nobody answers — the same discipline that runs through powers of attorney and informed consent requirements generally.
Sources
- Guttmacher Institute — Minors' access to STI services (as of 1 August 2026)
- 45 CFR § 164.502(g)(3) — parents as personal representatives of unemancipated minors
- California Family Code § 6550 — caregiver's authorization affidavit
- Journal of the Pediatric Infectious Diseases Society — Tennessee's Mature Minor Doctrine Clarification Act
General information, not legal advice. This guide explains how these documents and rules generally work. Law varies by jurisdiction and changes, and none of it is applied to your circumstances here. For anything consequential, consult a licensed attorney where you are.
Frequently asked
Can a grandparent consent to medical treatment for a grandchild?
Only with authority. Several states either recognise a signed caregiver authorisation from the parent or list relatives who may consent when the parent cannot be reached and has not objected. Without one of those, a grandparent can obtain emergency care and little else. The authority is also subordinate: a parent who is contactable and refuses overrides the grandparent's decision.
Can one parent consent to treatment without the other after a divorce?
It depends on the custody order. Legal custody carries the right to make medical decisions, and where it is joint, either parent can usually consent alone. Many orders require both parents to agree for surgery, psychiatric care or elective procedures, and many practices ask for both signatures regardless. Give the practice the relevant pages rather than describing them.
Does a child medical consent letter have to be notarised?
Usually not for a clinic visit, though some states' statutory caregiver forms have their own execution requirements. Notarisation matters most for international travel, where US guidance is that a letter of consent from the absent parent should be carried and preferably notarised. Notarisation proves who signed; it does not widen the authority the letter grants.
At what age can a teenager consent to their own medical treatment?
There is no single age. Most independent minor consent comes from statutes tied to the type of care rather than to age — STI testing and treatment in every state, and contraception, mental health, substance use and prenatal care in varying subsets. Separately, emancipated minors consent as adults, and a minority of states recognise a mature-minor doctrine for particular decisions.
Can parents see a teenager's medical records?
Usually yes, as the child's personal representative. The exception is care the minor lawfully consented to on their own, where the parent is generally not the personal representative for that information. Even then HIPAA defers to state law, which may permit, require or prohibit disclosure, and where it is silent the clinician exercises professional discretion.