How to Appeal a Denied Health Insurance Claim in California: Your Rights and Where to Start
How do I appeal a denied health insurance claim in California?
Start by filing an internal appeal with your insurer - California and federal law require plans to have this process, and you typically have 180 days from the denial to request one. If that appeal is denied or not resolved in time, you can request a free Independent Medical Review through the California Department of Managed Health Care at dmhc.ca.gov or 1-888-466-2219.
What is an Independent Medical Review in California and how does it work?
An Independent Medical Review, or IMR, is a free process run by the California Department of Managed Health Care in which an independent physician reviews your insurer's denial without any connection to the insurer. The insurer is legally required to follow the reviewer's decision. Standard reviews must be completed within 45 days; urgent cases within 3 days. Apply at dmhc.ca.gov.
How long does a health insurance appeal take in California?
For internal appeals, California insurers generally must decide within 30 days for prospective (future) care requests and 60 days for retrospective (already-received) care claims. Urgent internal appeals must be resolved within 72 hours. Independent Medical Reviews handled by the California Department of Managed Health Care take up to 45 days for standard cases and 3 days for urgent ones.
What if my employer's health plan denied my claim in California?
If your coverage comes through a self-insured employer plan, the California Department of Managed Health Care likely does not have jurisdiction, because large employer self-funded plans are regulated under federal ERISA law, not state law. Check your denial letter or ask your HR department whether your plan is fully insured or self-funded, then contact the U.S. Department of Labor for guidance on federal external review rights.
Can I appeal a Medi-Cal denial in California?
Yes. If a Medi-Cal managed care plan denies a service, you can file a grievance and internal appeal with the plan first. If you're still unsatisfied, you can request a State Fair Hearing through the California Department of Social Services. The process and timelines differ from commercial insurance appeals. The California Department of Health Care Services at dhcs.ca.gov provides guidance on Medi-Cal appeals.
A denied health insurance claim doesn't have to be the final word. California gives insured residents several distinct avenues to challenge a denial, and the state's Department of Managed Health Care runs one of the stronger consumer-protection systems in the country for this purpose. The process isn't simple, but it's navigable, and knowing which path fits your situation matters a lot.
Related: How to Appeal a Denied Health Insurance Claim in California - and When to Call the DMHC · Your California Health Insurance Claim Was Denied. Here's What to Do Next.
Why Claims Get Denied and Why It's Worth Appealing
Insurers deny claims for a range of reasons: a service was deemed not medically necessary, a provider was out of network, prior authorization wasn't obtained, or there's a billing code mismatch. Some of those reasons hold up; a lot of them don't. The California Department of Managed Health Care, which oversees most HMO and PPO plans sold in the state, reports that Independent Medical Reviews it handles frequently overturn insurer decisions, particularly on medical necessity grounds. That means a significant share of people who bother to appeal actually win, at least in part.
Before deciding which path to take, check your Explanation of Benefits (EOB) or denial notice carefully. It has to explain the reason for the denial, cite the specific plan provision the insurer relied on, and tell you how to appeal. Federal and state law both require this. If your denial notice doesn't include those things, that's itself a problem worth flagging.
Step One: File an Internal Appeal With Your Insurer
Your first step is almost always an internal appeal, meaning you're asking your insurer to take another look. California law and the Affordable Care Act require health plans to have an internal appeals process in place. You generally have 180 days from receiving a denial to file one, though your specific plan documents govern that window, so check them or call your insurer's member services line directly.
When you file, include everything that supports the claim: the denial letter, your doctor's notes, any referral documentation, a letter of medical necessity from your treating physician, and a written explanation of why you believe the denial was wrong. The more complete the record you build at this stage, the better positioned you'll be if you go to an external review. Plans are required to decide standard internal appeals within 30 days for prospective (future care) requests and 60 days for retrospective (already-received care) claims, with faster timelines for urgent situations.
Step Two: Request an Independent Medical Review Through the DMHC
If your internal appeal is denied, or if your plan doesn't resolve it in time, you can request an Independent Medical Review through the California Department of Managed Health Care. This is a free process, and it's one of the most powerful tools California residents have. An independent physician reviews your case without any connection to your insurer, and the insurer is legally required to follow whatever the reviewer decides.
You can apply for an IMR at the DMHC's Help Center, reachable at 1-888-466-2219 or through its online portal at dmhc.ca.gov. You can file an IMR application and a complaint at the same time, which is often worth doing. The DMHC generally must complete the review within 45 days for standard cases, 3 days for urgent cases. The review is available for denials on medical necessity, experimental treatment, or continuity-of-care grounds. There's no fee to the patient.
Note that the DMHC regulates most but not all plans sold in California. If your coverage is through a self-insured employer plan (common at large employers), it's regulated by the federal Department of Labor under ERISA, not the DMHC. Your denial letter or HR department can tell you which applies to you. If your plan falls outside DMHC jurisdiction, the California Department of Insurance handles some plans, and federal external review processes apply to others.
Urgent and Ongoing Treatment Situations
If your insurer has denied coverage for care you urgently need, or is refusing to continue paying for ongoing treatment, you don't have to wait out the standard timeline. California law allows you to request an expedited internal appeal for urgent situations, which insurers must resolve within 72 hours. You can also request an expedited IMR from the DMHC, which applies to cases where following the standard timeline could seriously jeopardize your health.
See also: Your California Health Insurance Claim Got Denied - Here's How to Fight It · How to Appeal a Denied Health Insurance Claim in California
If you're in the middle of treatment with a provider and your insurer terminates coverage for that provider mid-treatment, California has continuity-of-care protections that may allow you to continue seeing that provider temporarily. This is a separate process from a standard denial appeal, and the DMHC can explain whether it applies to your situation.
If You're on Medi-Cal
Medi-Cal operates under a different appeals structure. If your Medi-Cal managed care plan denies a service, you can file a grievance with the plan, then appeal to the plan, and ultimately request a State Fair Hearing through the California Department of Social Services if you're still unsatisfied. The California Department of Health Care Services at dhcs.ca.gov has guidance on this process. The timelines and rules differ from commercial insurance appeals, so don't assume the commercial process described above applies to a Medi-Cal denial.
Other Resources That Can Help
The DMHC Help Center is free and can walk you through which process applies to your situation before you file anything. If you have a coverage dispute tied to a Covered California plan you purchased through the state marketplace, Covered California's consumer assistance resources at coveredca.gov can help clarify whether the issue is with the plan itself or with your enrollment. For complex cases involving potential bad faith or significant dollar amounts, a patient advocate or an attorney who handles insurance disputes may be worth consulting, though that step isn't necessary for most IMR filings.
This is general information, not legal or financial advice. Specific timelines, eligibility rules, and processes can change, and your plan documents govern the details of your own situation. Verify current procedures with the California Department of Managed Health Care at dmhc.ca.gov or by calling 1-888-466-2219, and with the California Department of Health Care Services at dhcs.ca.gov for Medi-Cal-related questions.