Health Insurance Claim Denied? The Appeal That Works

Health insurance claim denied? Appeal it. You have a legal right to an internal appeal, usually at least 180 days from the denial notice, and to an independent external review if that fails. A large share of denials are administrative rather than medical, meaning a wrong code or a missing referral, and those are frequently fixed with one phone call.

A denied claim feels final. It is not. It is the opening position in a process that has legal deadlines, a required independent review, and a decent success rate for people who actually work it.

The reason most denials stand is that most people never appeal.

Why was your health insurance claim denied?#

Get the Explanation of Benefits and the denial letter, and find the reason code. If you are unclear on why you owe anything at all, start with how deductibles and coinsurance stack. Denials fall into three broad groups, and the group determines the strategy.

Most of the time a health insurance claim denied at the first pass falls into one of three groups.

Administrative. A wrong or outdated procedure code, a missing modifier, the wrong date of service, an eligibility record that had not updated, a missing referral, an out-of-network provider incorrectly identified. These are clerical, they are common, and they are frequently resolved with a phone call rather than a formal appeal.

Coverage. The plan says this service is excluded, or the plan year had ended, or the provider was genuinely out-of-network. Winning requires showing the plan document says otherwise, or that an exception applies.

Medical necessity. The insurer's reviewer concluded the service was not necessary, or that a cheaper alternative should have been tried first (step therapy), or that it was experimental. These are the hardest and the most worth fighting, because they are judgement calls made against published criteria you are entitled to see.

What documents can you demand?#

You are entitled, free of charge, to the documents the insurer relied on. Ask in writing for:

• The specific clinical criteria or medical policy applied to your case.
• The complete claim file, including internal notes and the reviewer's report.
• The credentials of the reviewing clinician: for a medical necessity denial, whether they practise in the relevant specialty is itself sometimes grounds for challenge.
• The exact plan language the denial relies on, with the section reference.

This step does most of the work. An appeal that quotes the insurer's own criteria and shows the criteria were met is a different document from one that argues the treatment was important.

How do you file the internal appeal?#

Your first formal step, decided by the insurer itself. You generally have at least 180 days from the denial.

Turnaround requirements are roughly: 30 days for a service you have not yet received, 60 days for one already provided, and 72 hours for an urgent case where delay would seriously jeopardise your health.

A useful appeal letter is short and structured:

1. Identify everything. Member ID, claim number, date of service, provider, the exact denial reason and code.
2. State what you want. Not "please reconsider". "I am requesting that claim 12345 be reprocessed and paid in full."
3. Answer the stated reason directly. If they said not medically necessary, address the specific criteria they applied, in their order.
4. Attach the evidence. A letter of medical necessity from your physician, relevant records, the published clinical guideline supporting the treatment, and prior authorisation correspondence if it exists.
5. Cite the plan. Quote the section that covers the service, by page and paragraph.
6. Set the deadline. State the regulatory response time and that you intend to pursue external review if it is not met.

What is an external review?#

If the internal appeal fails, an independent organisation with no relationship to your insurer reviews the case. HealthCare.gov sets out the process and CMS runs the federal external review. Their decision binds the insurer.

• You generally have four months from the final internal denial to request it.
• The reviewer is an independent body, and the insurer pays for it, not you.
• Standard reviews are decided within 45 days; expedited reviews for urgent situations within 72 hours.
• In urgent cases you can request external review at the same time as the internal appeal rather than waiting.

Depending on your plan and state, this is run either by your state insurance department or through the federal process. The denial letter must tell you which applies and how to file.

Where do you escalate if the appeal fails?#

If the appeal route stalls:

• Your state department of insurance regulates fully insured plans and takes consumer complaints seriously. A complaint frequently produces movement that letters did not.
• The Department of Labor oversees self-funded employer plans, which are not state-regulated. If your coverage comes from a large employer, this is likely the correct regulator.
• Your employer HR or benefits team has leverage with the insurer that you do not. Use it. If the plan itself is the problem, check whether a different network type suits you at renewal.
• The hospital's patient advocate or billing department can often reprocess, reduce or write off charges independently of the insurance dispute.

Deadlines, in one place#

Your own plan documents govern. Take the deadlines from your denial letter, not from this table, and diarise them the day the letter arrives.

The realistic view#

Not every health insurance claim denied is wrongly denied, and not every appeal succeeds. Some services genuinely are excluded from your plan, and reading the plan document carefully sometimes tells you the insurer is right.

But the system quietly relies on people giving up. The deadlines, the codes and the letters are all friction, and friction works. Anyone who reads the denial properly, asks for the criteria, and answers them in writing is already doing more than most claimants ever do, and that is usually what the outcome turns on.