A denial letter is a decision to challenge, not a universal set of instructions. The right appeal depends on the kind of insurance, the policy or plan, the reason for the denial, and the deadline in the notice.

For many U.S. health plans, you may have up to 180 days to request an internal appeal. That rule does not automatically apply to auto, property, life, disability, workers' compensation, Medicare, or Medicaid claims. Use the deadline and instructions in your own notice first.

This is general consumer information, not legal advice.

First actions after a denial

  1. Read the denial letter, explanation of benefits (EOB), or claim notice. Find the reason, claim number, policy provision, deadline, and submission address.
  2. Put the deadline on your calendar today. Don't rely on a generic deadline from an online article.
  3. Ask for the documents used in the decision, including relevant policy language, review notes, and missing records.
  4. Check whether the problem is a correctable billing or filing error, a coverage dispute, or both.
  5. Gather only the evidence that answers the insurer's stated reasons.
  6. Write a point-by-point appeal that says exactly what you want changed.
  7. Submit it through the required channel and keep proof that it arrived.
  8. Ask for an expedited health-plan review if waiting could seriously affect your health.
  9. If the denial is upheld, read that notice for external review, a regulator complaint route, or another appeal.

Which rules control the claim?

The insurer's brand name does not tell you the whole appeals process. Start with the policy, certificate of coverage, summary plan description, denial notice, and applicable state or federal rules.

Claim type Start with Important distinction
Health insurance EOB, denial letter, plan documents, and member handbook Many ACA-regulated plans offer internal appeals and external review. Medicare and Medicaid use separate instructions.
Employer health, disability, or life insurance Summary plan description, certificate, and plan administrator ERISA procedures may apply to a private employer plan. Ask whether the plan is insured or self-funded.
Individual disability or life insurance Policy, endorsements, and claim instructions The policy and state law generally control the deadline and review route.
Auto or property insurance Declarations page, exclusions, adjuster letter, and claim file Deadlines and complaint procedures vary by state and policy.
Workers' compensation State workers' compensation agency and official decision This is usually an administrative process, not an ordinary consumer insurance appeal.

An employer plan that pays claims directly may not be regulated by a state insurance department in the same way as an insured policy. Ask the plan administrator which entity made the decision and where the appeal must go.

Read the denial notice closely

Before arguing that the decision is unfair, identify the exact decision you need to overturn. Write down:

An EOB is not necessarily the same as a medical provider's bill. Compare the EOB with the itemized bill, then ask the provider's billing office to explain any difference.

Claim codes are shorthand and can vary between insurers and claim systems. Use the description that accompanies the code instead of guessing what the code means.

Match evidence to the denial reason

Denial reason Evidence or response to consider
Missing information Supply the requested records, forms, referral, invoice, or proof of payment.
Incorrect coding or duplicate claim Ask the provider or repairer to verify and correct the submission. Include the corrected claim or confirmation.
Not covered or excluded Quote the relevant coverage section and explain why the service or loss falls within it, or why the exclusion does not apply.
Medical necessity or treatment criteria Provide patient-specific records and a clinician's explanation of the diagnosis, treatment, risks, and alternatives.
Prior authorization, referral, or network issue Include authorization records, referral paperwork, directory screenshots, emergency-care details, and communications with the plan.
Timely filing or eligibility Show the submission date, confirmation number, active coverage, premium payment, or other proof that addresses the denial.
Auto or property causation dispute Use photos, reports, maintenance records, repair estimates, receipts, witness information, and policy language about the covered event.
Valuation dispute Compare the insurer's calculation with estimates, replacement costs, receipts, or other evidence supporting the amount claimed.

Ask for a corrected claim when there is an obvious coding or filing error, but don't let that process consume the appeal deadline. A corrected claim and a formal appeal can be separate matters.

Ask for the claim file and missing documents

The first denial letter may not contain everything the insurer or plan reviewed. Ask for the following in writing, when applicable:

Keep both your request and the response. If the insurer says a file or document is unavailable, ask it to identify what it did review and explain the basis for the decision.

Build an evidence file

A large document dump can hide the point of your appeal. Organize each attachment around a specific denial reason, and use a short cover list so the reviewer can find it.

Health insurance

Consider including:

A useful clinician letter does more than say a treatment is needed. It should explain the patient's diagnosis, why the treatment is appropriate for that patient, alternatives considered, and risks or consequences that could result from delay. It should respond to the insurer's stated reason for denial.

Disability insurance

Connect the medical evidence to the policy's definition of disability and to the claimant's actual work. Depending on the policy, useful records may include:

A diagnosis by itself may not show that the policy's definition is met. Describe what the condition prevents the claimant from doing and identify the records supporting those limitations.

Life insurance

Check the coverage and exclusion language, then gather:

If the denial concerns an alleged lapse, misrepresentation, or exclusion, answer that issue directly and keep every communication.

Auto and property insurance

Organize:

If the dispute is only about the amount of damage, check whether the policy has an appraisal provision. Appraisal, when available, may address valuation but does not necessarily decide whether the loss is covered.

Write the appeal letter

Keep the letter factual. Answer each denial reason separately, cite the policy or plan language, and state the remedy you want.

[Your name]
[Address]
[Phone and email]
[Date]

[Insurer or plan administrator]
[Appeals address or department]

Re: Formal appeal of claim [claim number]
Policy or member number: [number]
Date of denial: [date]
Date of service or loss: [date]

Dear Appeals Department:

I am appealing the denial of [describe the medical service, benefit, repair, or loss]. The denial is dated [date] and gives this reason: [quote or accurately summarize the reason].

I request that you reverse the denial and [pay the claim, authorize the treatment, approve the benefit, or reconsider the covered loss].

The decision should be changed for these reasons:

1. Coverage: [Cite the policy or plan section and explain how it applies.]
2. Facts: [Summarize the relevant medical, employment, accident, or loss facts.]
3. Evidence: [Explain what the attached records, statements, estimates, or receipts show.]
4. Error to correct: [Identify any coding, eligibility, network, filing, or factual error.]

If information is missing, please identify each missing item and explain how it affects the decision. If you uphold the denial, please provide the final written determination, the specific plan or policy provisions relied on, and instructions for any available external review or further appeal.

[If applicable: Because delay could seriously affect my health, please treat this as an expedited appeal.]

Sincerely,

[Your name]

Attachments:
1. [Denial notice or EOB]
2. [Policy or plan page]
3. [Medical, employment, accident, or repair evidence]
4. [Other supporting documents]

Use the insurer's required form when one exists. Add a letter if the form does not leave enough room to explain the dispute.

Submit the appeal and document delivery

Follow the notice exactly. The insurer may require an online portal, fax, mail, or a particular department. Sending a message to general customer service may not count as a formal appeal.

Before you send it:

HealthCare.gov's internal appeals guidance also recommends keeping original documents and recording conversation details.

A phone call can clarify the process, but don't assume it starts or preserves an appeal. Follow the written procedure and get important answers in writing.

Health insurance: internal appeal and external review

The Affordable Care Act requires many health plans to meet standards for internal appeals and external review. The rules don't apply identically to every plan. Grandfathered plans, government programs, and some employer arrangements can follow different procedures.

For a typical health-plan denial:

  1. File the internal appeal by the deadline in the notice.
  2. Explain why the denial conflicts with the plan language or evidence.
  3. Ask the provider to correct any claim-submission error.
  4. Wait for the written internal decision unless an urgent exception applies.
  5. If the denial is upheld, follow the notice to request external review.
  6. File the external-review request separately if that process requires it.

CMS consumer guidance says a health-plan member generally has up to 180 days after receiving a denial to file an internal appeal. The plan's notice still controls the process you must follow, particularly if it provides a longer period or identifies a special procedure.

If delay could seriously affect your health, request an expedited appeal. HealthCare.gov explains that a final decision must come as quickly as the medical condition requires and no later than four business days after the request is received. An oral decision must be followed by written notice within 48 hours.

In some urgent situations, you may be able to request internal and external review at the same time, especially when the internal process is waived or waiting would risk your health. Ask the plan or review organization before assuming that exception applies.

What external review does

External review sends an eligible dispute to an independent review organization instead of leaving the final medical-necessity decision solely with the insurer. The reviewer may uphold the denial or overturn it.

The denial notice should explain whether external review is available, the filing deadline, the required form, and where to send the request. Use the current address in that notice rather than an old address found online.

Some state processes use their own forms and review organizations. HealthCare.gov's external-review guidance says that, where a fee is charged under the applicable process, it cannot be more than $25 per review under the federal standard. Check the plan and state rules for fee waivers and exceptions.

External review is not available for every dispute. If the plan is grandfathered or otherwise outside the applicable ACA process, ask the plan administrator or state insurance department which route applies.

ERISA plans: employer health, disability, and life benefits

ERISA is a federal law that can govern benefits provided through many private employers. It doesn't automatically apply to every employer or every insurance policy. Ask whether the employer plan is insured or self-funded and identify the plan administrator.

The summary plan description and denial notice should explain:

Many ERISA plan notices use a 180-day appeal period, but the plan terms and type of claim control. Disability claims have particular federal claims-procedure requirements, including a generally applicable 45-day decision period with permitted extensions in qualifying circumstances. The governing regulation is 29 C.F.R. section 2560.503-1.

Submit your strongest evidence during the internal appeal. Depending on the plan and the court, a later ERISA dispute may be evaluated largely from the administrative record. Don't assume that the ACA external-review process applies to an ERISA disability or life-insurance denial.

For a high-value claim, a disputed disability definition, or a deadline that is close, prompt advice from an attorney familiar with ERISA may be useful. Missing the internal appeal can affect later options.

Auto, property, life, and workers' compensation claims

Auto and property

Start with the policy and the adjuster's written explanation. Respond to the precise issue:

If reconsideration doesn't resolve the dispute, a complaint to your state insurance department may help identify claim-handling or procedural problems. A regulator may not decide every coverage or valuation dispute and may not award the amount you seek. A complaint is not a substitute for the policy's appeal process.

Life insurance

Follow the review procedure in the policy or claim notice. Preserve proof of beneficiary status, premium payments, and the records used to answer the denial.

Life policies can contain different exclusions, deadlines, and contestability provisions. Quote the language that applies instead of relying on a general insurance rule.

Workers' compensation

Workers' compensation has its own notice deadlines and administrative appeal process. Contact the state workers' compensation agency identified in the decision and follow its filing instructions. An ordinary letter to the employer's commercial insurer may not protect your rights.

If the appeal is denied

Keep the final written decision, then take these steps:

  1. Check whether another review is available. A health-plan notice may offer external review or an independent medical review.
  2. Compare the final decision with your submission. Look for an ignored document, wrong date, incorrect policy provision, or a new reason that wasn't in the first denial.
  3. Ask for clarification in writing, including the records, criteria, and policy language used in the final decision.
  4. Contact the correct regulator. State insurance departments handle many state-regulated policies, while employer plans and government programs may have different complaint routes.
  5. Address any provider bill. Tell a medical provider in writing that the claim is under appeal and ask about payment arrangements. An appeal does not automatically cancel a bill or stop collection activity.
  6. Consider timely professional help for a large life or disability claim, an ERISA matter, a threatened lawsuit, or a dispute involving complex policy language.

Don't assume that a regulator complaint extends the appeal deadline. File the appeal first, or ask the regulator in writing how its process interacts with the pending deadline.

Mistakes that can weaken an appeal

Frequently asked questions

How long do I have to appeal a denied insurance claim?

For many health plans, the internal appeal period is up to 180 days, but the denial notice and plan documents control. Auto, property, life, disability, and workers' compensation deadlines vary. Use the earliest deadline in your documents unless the plan or insurer confirms otherwise in writing.

Can my doctor or repair shop file the appeal?

A provider or repair shop may be able to correct and resubmit a claim. An authorized representative may also be able to appeal for you. Ask whether a separate authorization or member signature is required. If the deadline is close, submit your own appeal as well.

What if I missed the deadline?

File immediately and explain the reason for the delay. Ask whether the insurer has a late-appeal or good-cause exception, but don't assume it must accept the filing. Keep proof of delivery and request a written response.

Can I request external review before the internal appeal ends?

Sometimes, particularly for urgent health-care disputes or when the plan waives the internal process. The notice and applicable state or federal rules control. Ask the plan or review organization before filing.

Does a complaint to the insurance department overturn the denial?

A regulator may investigate whether the insurer followed required procedures, but it may not decide every coverage or valuation dispute. A complaint usually doesn't replace the insurer's appeal process or pause its deadline.

Should I hire a lawyer?

Prompt legal help may be worthwhile for an ERISA disability or life claim, a large financial loss, repeated denials, a policy-exclusion dispute, or a matter approaching litigation. For a straightforward missing-document or billing error, a well-documented self-filed appeal may be enough.

Official starting points

Before gathering anything else, write down the deadline, the denial reason, and the remedy you want. Those three lines will show you which documents belong in the appeal and which can wait.