California health insurance appeal rights

Sarah Chen, RN-BSN, CPCSarah leads InsureDefense's clinical review. 12 years working appeals at a major US payer plus 4 years as a patient advocate.

Published May 14, 2026

Internal appeal in California

Under the ACA, you generally have 180 days from the date you receive the denial notice to file an internal appeal. The insurer must decide the appeal within 30 days for pre-service claims, 60 days for post-service claims, and 72 hours for expedited appeals where waiting could jeopardize your health.

The California Department of Insurance oversees consumer protections for California health-insurance plans. If your insurer fails to decide the appeal within the required timeline or refuses to consider your appeal, you can file a complaint at https://www.insurance.ca.gov/.

External review in California

California runs the Independent Medical Review (IMR) for external review of denied health-insurance claims. After your internal appeal is denied, you have 180 days to request external review. The independent reviewer is not affiliated with your insurer, and the decision is binding under federal and state law.

You can request external review at https://www.dmhc.ca.gov/FileaComplaint/IndependentMedicalReviewComplaintForms.aspx.

California IMR is run by DMHC (not CDI) for HMO plans. PPO plans may go through CDI. Strongest consumer-protection state for medical necessity disputes.

How InsureDefense supports California appeals

Our standard tiers prepare your internal appeal with citations to the relevant California appeal-rights provisions. After internal appeal, our External Review Pack ($199) prepares the state-specific submission packet for the Independent Medical Review (IMR).

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Frequently asked questions

What state agency handles health insurance complaints in California?

The California Department of Insurance is the state agency that handles complaints about health insurers operating in California. You can file a complaint at https://www.insurance.ca.gov/.

How does external review work in California?

California uses the Independent Medical Review (IMR). After your internal appeal is denied, you generally have up to 180 days to request external review. The review is conducted by an Independent Review Organization that is not affiliated with your insurer, and its decision is binding. California IMR is run by DMHC (not CDI) for HMO plans. PPO plans may go through CDI. Strongest consumer-protection state for medical necessity disputes.

How long do I have to file an internal appeal in California?

Under federal ACA rules, California consumers generally have 180 days from receiving the denial notice. The exact deadline is on the denial letter — some plans allow longer windows than the federal minimum.

What if my employer plan is self-funded?

Self-funded employer plans in California are regulated by federal ERISA rules rather than state insurance law. They still have appeal rights — including external review — but the external-review process often uses the federal HHS-administered procedure instead of California's Independent Medical Review (IMR).

Not legal, medical, or insurance advice.

InsureDefense is not a law firm, insurer, medical provider, or claims adjuster. We do not provide legal, medical, or insurance advice. We prepare appeal documents based on the information you provide. We do not guarantee approval, payment, coverage, or reimbursement. For urgent medical situations, contact your doctor, insurer, or emergency services directly.