How long do I have to appeal a health insurance denial?

For most non-grandfathered plans under the ACA you have at least 180 days from the date of the denial notice to file an internal appeal. Your denial letter states your exact deadline — always confirm against the letter and your plan documents.

Do health insurance appeal outcomes vary?

Yes. There is no reliable universal success rate for an individual appeal. Outcomes vary by plan, denial reason, governing rules, and the case record. A complete, timely submission helps the reviewer evaluate the dispute but does not guarantee reversal.

What should an appeal letter include?

Your identifying details (member ID, claim number), the exact denial reason quoted from the letter, why the denial is wrong with reference to your plan's own language, supporting clinical evidence from your doctor, and a clear request to reverse the decision by a stated date.

What if my internal appeal is denied?

An eligible medical-judgment, experimental or investigational, rescission, or No Surprises Act dispute may qualify for independent external review. Federal standards generally use a four-month request window, but the final denial identifies the applicable state, federal, or plan-contracted route and deadline.

How to appeal a health insurance denial, step by step

UPDATED JULY 2026 · U.S. PLANS · NOT LEGAL OR MEDICAL ADVICE

A denial is not necessarily the last word. Internal appeal and, for eligible disputes, external review let you ask for a documented reconsideration. The governing rules depend on your plan type, so start with the denial notice and protect every stated deadline.

Common federal benchmarks — check your plan for the rules that apply

Your internal-appeal window: at least 180 days for many non-grandfathered commercial plans and ERISA-covered private employer plans; other programs and plans can differ.
One-level internal-appeal benchmarks: no more than 30 days for many pre-service appeals, 60 days for post-service appeals, and 72 hours for qualifying urgent-care appeals. Plans with two levels may divide those periods.
If they deny again: an eligible dispute may go to independent external review. Follow the route and deadline in the final denial.

Step 1 — Read the denial letter like a lawyer would

For plans subject to federal claims rules, the notice generally must identify the specific reason, relevant plan provision, and review procedure; medical-judgment denials have additional explanation requirements. Find the exact denial reason — it decides your strategy:

"Not medically necessary" — a medical-judgment denial that calls for case-specific clinical support.
Prior authorization denied — approval was refused before treatment.
Step therapy / "fail first" — they want you to try cheaper drugs first.
Formulary exclusion — your medication isn't on their covered list.
Out-of-network denial — the provider wasn't in their network.
"Experimental / investigational" — they claim the treatment is unproven.

Request the documents and records relevant to the decision and any rule, guideline, or protocol the plan relied on. Federal rules give many commercial-plan participants access to this material without charge, but the exact disclosure right depends on plan type. Quoting the applicable policy keeps the appeal focused on the stated criteria.

Step 2 — Gather the evidence that actually moves reviewers

A treating-clinician letter for a medical-judgment denial. It should address the insurer's stated criteria point by point. Administrative and eligibility disputes may need different evidence.
Relevant medical records — test results, imaging, chart notes showing history and failed alternatives.
Peer-reviewed evidence or clinical guidelines supporting the treatment (your doctor can point to them).
Your plan documents — the Evidence of Coverage language that covers your situation.

Step 3 — Write the appeal letter

Keep it factual, referenced, and firm. Structure: who you are → what was denied (quote their words) → why the denial is wrong under their own plan language → the evidence attached → what you want and by when. Use our free appeal letter template, or the reason-specific templates in each guide above.

Step 4 — File the internal appeal (and prove you did)

Follow the exact filing instructions in the denial letter (portal, fax, or mail).
Send mail certified with return receipt; screenshot portal confirmations.
If the case meets the plan's urgent-care standard, say "I am requesting an expedited appeal" and attach the clinician's explanation. The request itself does not create urgency; the applicable medical standard and plan rules control the deadline.
Keep a log of every call: date, name, reference number.

Step 5 — If they deny again: external review

Eligible disputes can be reviewed by an independent organization outside the plan. Federal standards generally provide a 4-month request window, with a standard decision due no later than 45 days and qualifying expedited review no later than 72 hours. State, federal, and plan-contracted routes differ, and not every denial qualifies. Full details and the current July 2026 federal-process notice: our external review guide.

Free template to start from

The general-purpose letter below works for most denials — swap in your details and attach your evidence. For a stronger, reason-specific letter, use the guide matching your denial reason above.

Free template — general internal appeal

[Your name] [Address] · [Phone] · [Email] Member ID: [ID] · Claim/Reference #: [number] [Date] [Insurer name] — Appeals Department [Address from your denial letter] RE: Appeal of denial dated [date] — [service/medication denied] To the Appeals Department: I am appealing your denial of [service/medication], dated [date]. Your letter states the denial reason as: "[quote the exact sentence from the letter]." This denial is inconsistent with the terms of my plan and with my medical record, for the following reasons: 1. [Plan language: quote the Evidence of Coverage section that covers this service.] 2. [Medical facts: diagnosis, history, why this specific treatment is needed.] 3. [What has already been tried and failed, if applicable.] Enclosed with this appeal: - Letter of medical necessity from Dr. [name], dated [date] - Relevant medical records ([list]) - [Any supporting guidelines or studies] I request that you reverse this denial and authorize/pay for [service]. Please send your written determination within the timeframe required by law. If any information is missing, contact me at [phone] rather than denying on administrative grounds. Sincerely, [Signature] [Name]

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Frequently asked questions

How long do I have to appeal?

At least 180 days from the denial notice for most non-grandfathered plans. Your letter states your exact deadline — it controls. Mark it the day the letter arrives.

Do appeals actually work?

Appeals can result in a reversal or an upheld denial, but no overall statistic predicts a specific case. File on time, answer the stated reason, and include the evidence relevant to that issue; none of those steps guarantees an outcome.

Should my doctor be involved?

For a denial involving medical judgment, a treating clinician can explain the diagnosis, history, and why the requested care meets the disputed criteria. Administrative, network, coding, or eligibility denials may require different records instead.

What about Medicare or Medicaid denials?

They use different appeal systems with their own deadlines and forms. This guide covers commercial insurance (employer or marketplace plans). Start at medicare.gov or your state Medicaid agency for those.