How to appeal a denied insurance claim

Here's the statistic insurers would rather you not dwell on: a large share of denied claims are overturned on appeal — for health insurance, studies routinely find that 40–60% of appealed denials succeed at some stage. Yet fewer than 1% of denied health claims are ever appealed. Most people read the word 'denied,' assume it's final, and eat the cost. A denial is not a verdict. It's an opening offer.

Step 1: Get the denial in writing and decode it

Every denial must cite a reason: 'not medically necessary,' 'pre-existing damage,' 'excluded peril,' 'coding error,' 'lapsed coverage.' That reason is your target — your entire appeal is built to defeat that one sentence. Call and ask for the specific policy language or plan provision the denial rests on. For health claims, request the clinical criteria the reviewer used. You're legally entitled to this information.

Step 2: Read your actual policy

Not the marketing brochure — the policy document or, for health insurance, the Evidence of Coverage. Look up the cited exclusion and read it word for word. Denials frequently rely on a stretched reading of policy language, or cite an exclusion with an exception buried two paragraphs down. If the denial says 'flood damage excluded' but your loss was a burst pipe (typically covered), you've already won on paper.

Step 3: Build the paper file

1. Request your complete claim file from the insurer — adjuster notes, photos, internal reports. In many states they must provide it.
2. Gather independent evidence: a second repair estimate, a contractor's letter, your doctor's letter of medical necessity, dated photos.
3. Write a chronology: every call, every name, every date, every promise. Disputes are won by the side with the better paper trail.
4. Draft the appeal letter: state the claim number, quote the denial reason, quote the policy language that contradicts it, attach evidence, and ask for a specific remedy by a specific date.

The health insurance track: internal, then external

Health appeals have a formal two-stage structure under the ACA. First, an internal appeal: the insurer must re-review, typically within 30 days for pre-service claims and 60 days for post-service. If that fails, you're entitled to an external review by an independent third party — and the insurer is bound by the result. External reviewers side with patients in roughly 40% of cases. Your doctor is your best weapon here: a peer-to-peer call between your physician and the insurer's medical director resolves many denials before the paperwork even finishes.

Escalation paths when the appeal stalls

• State insurance commissioner: a free complaint that insurers take seriously, because regulators track complaint ratios.
• Public adjuster (home claims): licensed professionals who negotiate on your behalf for ~10% of the payout. Worth it on large, complex losses.
• Your state's Consumer Assistance Program for health claims — free help navigating appeals.
• An attorney, for large denials — many take bad-faith insurance cases on contingency, and 'bad faith' exposure changes an insurer's math fast.

The bottom line

Insurers process denials at industrial scale; appeals get individual attention. The overturn rates prove that persistence pays — the system quietly rewards the small minority who push back with documentation and deadlines. Decode the denial, quote the policy, build the file, and escalate on schedule. 'Denied' is the beginning of a negotiation, not the end of one.

The odds, in numbers

Mistakes that sink otherwise strong appeals

• Appealing by phone only. Verbal appeals leave no record and often never enter the formal process — always submit in writing and keep proof of delivery.
• Restating the hardship instead of attacking the denial reason. Reviewers can't approve a claim because it's unfair; they can approve it because the cited exclusion doesn't apply.
• Sending originals. Mail copies, keep originals, and send anything important with tracking or certified mail.
• Missing the second window. An internal denial starts a new clock for external review — many people win stage one's right to escalate and then let it lapse.
• Cashing a check marked 'full and final settlement' while still disputing. In some states that can waive your right to further recovery; ask the insurer to reissue it as a partial payment.

Finally, remember that persistence is disproportionately rewarded because the insurer's cost structure works in your favor at appeal time. Processing a denial costs them almost nothing; defending a well-documented appeal in front of an external reviewer or a state regulator costs real staff hours. Once your file makes clear that you will keep escalating, settling correctly often becomes their cheapest option.

A practical note on tone and channel: address the appeal to the insurer's formal appeals or grievance address from the denial letter, not to the adjuster who issued the denial, and copy yourself into a dated folder — physical or digital — that holds the entire claim in chronological order. If a call produces a promise, follow it with a same-day email summarizing what was said and asking for correction if you've misunderstood. That one habit converts every verbal assurance into evidence, and it is the difference between 'they told me it was covered' and a dated document saying so.