How to Appeal a Denied Health Insurance Claim in California - and When to Call the DMHC
How do I appeal a denied health insurance claim in California?
In California, start by filing an internal appeal with your health plan in writing, referencing your claim number and including supporting documentation from your doctor. If the denial is based on medical necessity and the internal appeal fails, you can request a free Independent Medical Review through the California Department of Managed Health Care at dmhc.ca.gov or by calling 1-888-466-2219.
What is California's Independent Medical Review and how does it work?
California's Independent Medical Review (IMR) is a free process run by the Department of Managed Health Care in which a clinical reviewer with no ties to your insurer evaluates a denial based on medical necessity or experimental treatment grounds. If the reviewer sides with you, your insurer is legally required to comply. Standard reviews typically resolve within 30 days; urgent cases may qualify for a 3-business-day expedited review.
Can I skip my insurer's internal appeal and go straight to the DMHC?
In most cases, California requires you to complete your health plan's internal grievance and appeal process before requesting an Independent Medical Review from the DMHC. However, if your situation involves an urgent or serious health threat, you may qualify to request an expedited IMR at the same time as your internal appeal. Contact the DMHC Help Center at 1-888-466-2219 to confirm whether your case qualifies.
Does the DMHC handle appeals for all California health insurance plans?
No. The DMHC regulates health plans licensed under California's Knox-Keene Act, which includes most HMOs and many PPOs sold individually or through employers. Self-funded employer plans are generally governed by federal ERISA rules, not California state law, and fall outside DMHC jurisdiction. If you're unsure which applies to your plan, ask your employer's HR department or call the DMHC Help Center at 1-888-466-2219.
How do I appeal a Medi-Cal denial in California?
If your Medi-Cal managed care plan denies or limits a service, you have the right to request a State Fair Hearing through the California Department of Social Services. Your denial notice should explain how to initiate that process. The California Department of Health Care Services, which oversees Medi-Cal, can also provide guidance at dhcs.ca.gov. The DMHC's Independent Medical Review process may also be available in some Medi-Cal managed care situations.
Getting a health insurance claim denied is stressful enough on its own. Getting one denied without a clear explanation, or without knowing you have the right to fight it, makes it worse. In California, state law gives patients more tools to challenge denials than most Americans realize - including a free, independent review process that your insurer can't block.
Related: How to Appeal a Denied Health Insurance Claim in California - and When to Call DMHC · How to Fight a Denied Health Insurance Claim in California - and When to Call in the DMHC
What a Denial Notice Actually Has to Tell You
Under California law, your health plan is required to send you a written denial notice that explains the specific reason for the denial and tells you how to appeal. If the denial is based on medical necessity - meaning the plan decided a treatment wasn't medically required - it has to cite the clinical criteria it used to make that call. If your notice doesn't include those details, that's itself something you can raise in an appeal. Keep every piece of paper your insurer sends you about the denial, including the date you received it.
There are two types of denials worth knowing: a denial of a claim you've already received care for, and a denial of prior authorization for care you haven't received yet. The appeals process is similar for both, but the urgency is different. If you're waiting on a treatment you need, you'll want to move faster.
Your Insurer's Internal Appeal Process - Step One
Before you can take a dispute outside the insurance company, California generally requires you to first go through the plan's own internal grievance and appeal process - or, in some urgent cases, you can skip straight to an external review. For a standard appeal, your plan is required by state law to resolve it within 30 days for non-urgent cases and 3 business days for urgent ones, though the California Department of Managed Health Care recommends confirming those timeframes with your specific plan.
When you file an internal appeal, put it in writing. State clearly that you're disputing the denial, reference the claim number or prior authorization number, and include any documentation from your doctor supporting the medical necessity of the treatment or service. If your doctor is willing to write a letter specifically addressing the insurer's stated reason for denial, include it. A physician's letter that directly counters the plan's clinical criteria is among the most useful evidence you can submit.
The IMR: California's Independent Review Process
This is where California's system differs significantly from what many states offer. If your health plan denies or modifies a service as not medically necessary, experimental, or investigational, you have the right to request an Independent Medical Review from the California Department of Managed Health Care. The IMR is conducted by a clinical reviewer with no connection to your insurer, it's free to you, and the insurer is legally bound by the outcome if the reviewer sides with you.
You can apply for an IMR online at the DMHC Help Center at hbex.coveredca.com/dmhc - but more directly, dmhc.ca.gov is where the DMHC operates its Help Center portal. You can also call the DMHC Help Center at 1-888-466-2219. In most cases, you need to have gone through your plan's internal appeal process first before requesting an IMR, but for urgent situations involving imminent and serious threats to your health, you can apply for an expedited IMR simultaneously. The DMHC Help Center can tell you whether your situation qualifies for that track.
The standard IMR timeline is 30 days after the DMHC receives your complete application. Expedited IMRs are supposed to resolve within 3 business days. If the independent reviewer overturns the denial, your plan must authorize or pay for the service. Confirm current timelines and process requirements with the DMHC directly, as these can be updated by regulation.
See also: How to Appeal a Denied Health Insurance Claim in California · Your California Health Insurance Claim Was Denied. Here's What to Do Next.
Filing a Complaint With the DMHC Directly
Not every denial is a medical necessity dispute. If your insurer billed you incorrectly, misapplied your benefits, or you believe your plan isn't following California coverage rules, you can file a complaint - separate from an IMR request - with the DMHC. The agency has authority to investigate health plans regulated under the Knox-Keene Act, which covers most HMOs and many PPOs sold in California.
One important note on jurisdiction: if your insurance is provided through a self-funded employer plan, it's generally regulated under federal ERISA rules rather than California state law, which means the DMHC may not have authority over it. If you're not sure which category your plan falls into, ask your employer's HR department or call the DMHC Help Center - they can tell you quickly whether your plan is under state or federal jurisdiction and point you to the right process if it's the latter.
If You're on Medi-Cal
Medi-Cal denials follow a different appeals path. If your Medi-Cal managed care plan denies or limits a service, you have the right to request a State Fair Hearing through the California Department of Social Services - this is separate from the DMHC's IMR process, though in some circumstances both paths may be available to you. Your denial notice should explain how to request a fair hearing. You can also contact the California Department of Health Care Services for guidance; DHCS oversees Medi-Cal at dhcs.ca.gov.
This is general information, not legal or financial advice. Appeal deadlines, process requirements, and DMHC jurisdiction rules can change. Verify current requirements and timelines directly with the California Department of Managed Health Care at dmhc.ca.gov or by calling the DMHC Help Center at 1-888-466-2219, and with the California Department of Health Care Services at dhcs.ca.gov for Medi-Cal-specific questions.