California’s informed consent requirements give every adult patient the right to receive whatever information a reasonable person would consider important before agreeing to medical treatment. That standard, set by the California Supreme Court in Cobbs v. Grant in 1972, is broader than the rule in most states, and it applies to every licensed healthcare practitioner in California, not just physicians.1Justia. CACI No. 532 Informed Consent – Definition When a provider fails to meet it, the patient may have grounds for a medical battery or medical negligence claim.
What Your Doctor Must Tell You Before Treatment
Informed consent in California is a conversation, not a form. Before a procedure, the practitioner must explain, in language the patient can actually understand:
- The nature and purpose of the procedure — what the doctor plans to do and why.
- The material risks, including any known risk of death or serious bodily harm inherent in the procedure, along with potential complications and side effects. A risk is “material” if a reasonable patient would factor it into the decision.
- The expected benefits and likelihood of success.
- Feasible alternative treatments, including doing nothing, and the risks tied to each.
- Any personal financial or research-related interest the doctor has that could influence their medical judgment.
The last item is unusual. Under Moore v. Regents of University of California, a physician seeking consent must “disclose personal interests unrelated to the patient’s health, whether research or economic, that may affect his medical judgment.”2Justia Law. Moore v. Regents of University of California – Supreme Court of California Decisions Most states don’t require this. California does.
The depth of disclosure scales with the danger of the treatment. For a routine blood draw and other simple procedures with only remote risks, an elaborate risk conversation isn’t required.3Justia Law. Cobbs v. Grant – Supreme Court of California Decisions For surgery or an invasive procedure, it is.
The Patient-Centered Standard That Sets California Apart
Most states judge a doctor’s disclosure duty by what other doctors in the same specialty would tell a patient. California rejected that. In Cobbs v. Grant, the state Supreme Court held that the yardstick is the patient’s need, not the medical profession’s customs. The scope of disclosure is “measured by the patient’s need, and that need is whatever information is material to the decision.”3Justia Law. Cobbs v. Grant – Supreme Court of California Decisions
The test is objective. The question isn’t what this particular patient wanted to know or what the doctor typically shares. It’s whether a reasonable person in the patient’s situation would have considered the information important when deciding whether to go forward. That framing runs through every part of California’s informed consent law, including the standard for suing over a violation.
Situations Where Consent Rules Bend
California recognizes a small number of narrow exceptions. Each carries strict conditions, and providers rely on them less often than patients tend to assume.
Emergency Treatment
Treatment may proceed without consent when three conditions are all met: the situation requires immediate action to preserve life, prevent serious bodily harm, or alleviate severe physical pain; obtaining consent is impracticable; and the treatment falls within customary practice for similar circumstances.4California Department of Public Health. AFL-14-11-Attachment-01 Urgency alone isn’t enough. If the patient is conscious and able to decide, the doctor still has to ask.
Therapeutic Privilege
A physician may withhold specific risk information if objective facts documented in the patient’s medical record show that full disclosure “would have so seriously upset the patient that the patient would not have been able to rationally weigh the risks of refusing” the recommended treatment.5Legal Information Institute. California Code of Regulations Title 22 Section 73524 – Informed Consent Requirements This exception is extremely narrow. It doesn’t cover bad news or a doctor’s fear that a patient will refuse treatment. The documented concern must be to the patient’s ability to think rationally. All other material information still has to be disclosed, and where possible the doctor must inform a patient’s representative instead.
Patient Waiver
A patient can voluntarily ask not to be told about specific risks. That request must be documented in the medical record. The waiver covers only what the patient declined to hear. Everything else still has to be disclosed.5Legal Information Institute. California Code of Regulations Title 22 Section 73524 – Informed Consent Requirements
Consent When the Patient Cannot Decide
Adults in California are presumed capable of making their own medical decisions. Capacity means the patient can understand the nature and consequences of the proposed treatment and communicate a choice, and it’s decision-specific. Someone might lack the ability to consent to complex surgery while still being fully able to decide whether to take a prescribed medication.
When an adult loses capacity, California uses a priority order that isn’t always what patients or families expect:
- A patient-designated surrogate. A patient can name any adult as a surrogate, orally or in writing, by telling their supervising healthcare provider. The designation lasts for the duration of treatment, the hospital stay, or 60 days, whichever is shorter. During that period, this surrogate takes priority over an agent named in an advance directive.
- An agent appointed under an Advance Health Care Directive or Power of Attorney for Health Care. The agent can make the same medical decisions the patient could make with capacity.6California Legislative Information. California Probate Code 4683
- A court-appointed conservator with authority over healthcare decisions.
- The closest available relative or friend. When no one holds formal legal authority, California case law allows the treating physician to turn to whoever is most familiar with the patient’s values. There is no rigid rank among family members in this situation.
The surrogate-over-agent priority catches people off guard. If you designated your sibling as your healthcare agent five years ago but told your doctor last week that your spouse should make decisions, your spouse takes priority for that treatment episode.
Consent Rules for Minors
Minors generally need a parent or legal guardian to consent to medical care. California carves out several exceptions.
A minor at least 15 years old who lives apart from their parents or guardian and manages their own finances qualifies as a self-sufficient minor and can consent to their own medical, dental, and vision care.7California Legislative Information. California Family Code Section 6922 The minor doesn’t need parental permission to live apart, and the source of income doesn’t matter.
Regardless of age, any minor may consent to medical care related to the prevention or treatment of pregnancy, though a minor can’t consent to sterilization without parental approval.8California Legislative Information. California Family Code Section 6925 Minors 12 or older can consent to outpatient mental health treatment if the provider finds the minor mature enough to participate meaningfully in care. The provider must attempt to involve the parent or guardian unless doing so would be inappropriate, and that determination must be documented.
Telehealth and Language Access
Before healthcare is delivered by telehealth, the provider must tell the patient telehealth will be used and obtain verbal or written consent, documented in the record. This is required by Business and Professions Code Section 2290.5 and comes on top of the standard informed consent conversation for whatever treatment happens during the visit.9California Legislative Information. California Business and Professions Code Section 2290.5
Consent is meaningless when the patient can’t understand the provider. California hospitals must adopt a policy for interpreter services for patients facing a language or communication barrier. Interpreters must be available on-site or by telephone around the clock and must be fluent enough to accurately translate medical terminology, including body parts, symptoms, and injuries.10California Legislative Information. California Health and Safety Code Section 1259 A patient can choose to use a family member or friend as an interpreter, but only after the hospital tells them professional services are available. The hospital cannot default to a family member and cannot ask a child to interpret.
Forms, Documentation, and Revoking Consent
Written consent forms are standard for major procedures, but the form is not the consent. The consent is the conversation. The form is evidence that the discussion happened and that the patient acknowledged the risks, benefits, and alternatives. When providers treat the form as a substitute for actual dialogue, that’s often where informed consent claims begin.
Certain procedures require additional written protocols. Sterilization, for example, requires a state-approved consent form signed by the patient, the person who obtained consent, and the physician who performed the procedure, provided in a language the patient understands.11Legal Information Institute. California Code of Regulations Title 22 Section 51305.3 – Informed Consent Process for Sterilization
A patient with capacity can revoke consent at any time, even after a procedure has started. When that happens, the healthcare team must stop. Providers should explain the medical risks of stopping, but the final decision belongs to the patient.
Legal Remedies When Consent Requirements Are Violated
California recognizes two separate claims, and the difference between them affects both what a patient has to prove and how much a case is worth.
Medical Battery
If a doctor performs a procedure the patient never agreed to, or performs a substantially different procedure than the one authorized, the claim is battery. Cobbs v. Grant reserved “the battery theory… for those circumstances when a doctor performs an operation to which the patient has not consented.”3Justia Law. Cobbs v. Grant – Supreme Court of California Decisions A patient doesn’t have to prove carelessness, only that the doctor deliberately deviated from what was authorized. Amputating the wrong limb or performing an additional procedure during surgery without authorization falls squarely here.
Negligent Failure to Obtain Informed Consent
The more common claim: the patient agreed to the procedure but was never told about a material risk that later caused harm. Under California’s jury instructions, the patient must prove four elements:
- The doctor performed the procedure.
- The doctor failed to disclose important potential risks or alternatives.
- A reasonable person in the patient’s position would not have agreed to the procedure if adequately informed.
- The patient was harmed by a risk that should have been disclosed.12Justia. CACI No. 533 Failure to Obtain Informed Consent
The third element decides most cases. The test isn’t what the actual patient would have chosen, but what a hypothetical reasonable person would have done with full information.3Justia Law. Cobbs v. Grant – Supreme Court of California Decisions A patient who would have gone through with the procedure anyway will struggle on causation.
Deadlines and Damage Caps
A negligent-consent claim falls under California’s medical malpractice statute of limitations: one year from the date the patient discovers (or should have discovered) the injury, or three years from the date of injury, whichever comes first. Exceptions exist for fraud, intentional concealment, and a foreign body left inside the patient.13California Legislative Information. California Code of Civil Procedure Section 340.5
Noneconomic damages (pain and suffering, emotional distress) are capped under the Medical Injury Compensation Reform Act as updated by AB 35. For cases filed in 2026, the cap is $470,000 for non-wrongful-death claims and $650,000 for wrongful-death claims. The caps increase annually through 2033.14California Legislative Information. AB-35 Civil Damages – Today’s Law As Amended Economic damages like medical bills and lost wages aren’t capped.
Battery claims sit outside these caps because they are intentional torts rather than professional negligence. The statute of limitations for battery is also different, generally two years from the date of the act. That gap between “no consent” and “inadequate consent” is often where informed consent litigation is fought.