What is a medical necessity denial?

A medical necessity denial means your insurance company claims the treatment your doctor ordered did not meet its clinical criteria. This does not mean your doctor was wrong — it means the insurer disagreed. You have the legal right to appeal.

Can I appeal a medical necessity denial?

Yes. You have a legal right to appeal any health insurance denial. Studies show over 40% of appeals are overturned when properly submitted. Most plans give only 30 to 180 days to file — act quickly.

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

Appeal deadlines are typically 30, 60, or 180 days from the denial letter date. Missing this deadline permanently forfeits your right to appeal. Check your denial letter or call your insurer immediately.

Is this template attorney-drafted?

Yes. This appeal letter template was drafted by an attorney with over a decade of insurance law experience. It is editable, includes a video tutorial, and is available as an instant download.

Why was my claim denied for out-of-network care?

Insurance companies deny out-of-network claims when the provider is not in their approved network. Many of these denials are wrongful — especially when care was urgent, when no in-network provider was reasonably available, or when you had no choice of provider in an emergency.

Can I appeal an out-of-network insurance denial?

Yes. You have the right to appeal, particularly if care was medically urgent, no in-network alternative was available, or the insurer failed to properly apply the No Surprises Act or state network adequacy rules.

What is the No Surprises Act?

The No Surprises Act protects patients from surprise bills for emergency care and for non-emergency care at in-network facilities by out-of-network providers when you had no meaningful choice of provider.

My insurance says my treatment is not covered — can I appeal?

Yes. Even when an insurer says a treatment is not covered or a policy exclusion applies, you can appeal. Many of these denials are based on ambiguous policy language or outright errors. An appeal forces the insurer to justify its reading of the policy.

What is a policy exclusion denial?

A policy exclusion denial means the insurer claims a specific clause in your policy excludes the treatment you received. These exclusions must be clearly stated — if the insurer cannot point to exact policy language, the denial may be wrongful and appealable.

Can I appeal a prior authorization denial?

Yes. You can appeal a prior authorization denial whether prospective, concurrent, or retrospective. Even if authorization was not obtained before care, you may have valid grounds — especially if care was urgent or the insurer's authorization process was unclear.

What if I had an emergency and could not get prior authorization?

Emergency care cannot legally require prior authorization. Cite the Emergency Medical Treatment and Labor Act (EMTALA) and your state emergency care laws in your appeal. Federal and state law require insurers to cover emergency stabilization regardless of prior authorization status.

How fast must insurers respond to a prior authorization appeal?

For urgent or ongoing care, you qualify for an expedited appeal — insurers must respond within 72 hours. For standard prior authorization appeals, deadlines are typically 30 days for pre-service decisions.

Can I appeal an experimental treatment denial?

Yes. Experimental or investigational treatment denials are among the most successfully appealed when the right evidence is presented. Insurers often apply outdated clinical criteria. A strong appeal presents published studies, clinical guidelines, and your physician's statement.

What evidence do I need to appeal an experimental treatment denial?

The strongest appeals include peer-reviewed clinical studies, published guidelines from major medical societies such as the AMA or ASCO, your treating physician's letter explaining why treatment is appropriate for your specific condition, and documentation showing the insurer's criteria are outdated.

What does denial code PR-1 mean?

PR-1 means Deductible Amount — Patient Responsibility. The insurer is applying the charge to your deductible. However, PR-1 denials are frequently incorrect — caused by calculation errors, timing issues, incorrect coordination of benefits, or provider and payer miscommunication.

Can I appeal a PR-1 deductible denial?

Yes. You can appeal if your deductible has already been met, if claims were processed in the wrong order, if there was a coordination-of-benefits error, or if the insurer incorrectly tracked your deductible accumulation.

What does denial code CO-167 mean?

CO-167 means the diagnosis code submitted does not justify the procedure billed. CO-167 denials are often caused by coding errors at the provider's billing office — not by a genuine lack of medical necessity.

How do I appeal a CO-167 diagnosis procedure mismatch denial?

Contact your provider's billing department to verify which codes were submitted. If codes were incorrect, ask the provider to resubmit. If codes were correct, file an appeal demonstrating the diagnosis supports the procedure using medical records and physician documentation.

What should I do first when my health insurance claim is denied?

Read the denial letter to find the denial reason and appeal deadline. Call your insurer for clarification. Gather your medical records, EOB, and insurance policy. File a formal internal appeal before the deadline — typically 30 to 180 days. Missing the deadline permanently forfeits your appeal rights.

Do I need a lawyer to appeal a health insurance denial?

No. Most health insurance denials can be appealed successfully without a lawyer using a well-structured appeal letter, your medical records, and your doctor's support. Attorney-drafted templates give you professional legal framing without the cost of retaining a lawyer.

What are the most important tips for winning a health insurance appeal?

Always file before the deadline. Address the specific denial reason rather than writing a generic letter. Get a detailed medical necessity letter from your treating physician. Include all relevant medical records. Cite clinical guidelines supporting your treatment. Send via certified mail and keep copies of everything.

What is the biggest mistake people make when appealing an insurance denial?

Writing a generic appeal that does not directly address the insurer's stated reason for denial. Each denial type requires different legal and clinical arguments. Match your arguments to the denial code and reasoning in your denial letter.

Are insurance companies using AI to deny claims?

Yes. Many major health insurers now use automated AI systems to review and deny claims — often without meaningful human review. These automated denials are legally challengeable through the standard appeal process.

What are the most common reasons health insurance claims are denied?

The most common reasons are: lack of prior authorization, treatment deemed not medically necessary, out-of-network provider, policy exclusion, diagnosis and procedure code mismatch (CO-167), deductible not met (PR-1), and experimental or investigational treatment classification. Most are appealable.

What is the difference between an internal and external insurance appeal?

An internal appeal is reviewed by your insurance company and is the required first step. An external appeal is reviewed by an independent organization — and its decision is legally binding on the insurer. Under the ACA, most health plans must offer external review after an internal appeal denial.

Your Health Insurance Claim Was Denied. Here's What You Can Do About It.

May 4

Written By Tatiana Kadetskaya

A denial is not the final word. Federal law gives you the right to fight back — and a well-crafted appeal letter can make all the difference.

"An estimated 200 million insurance claims are denied in the United States each year — yet fewer than one in ten patients ever files an appeal. Those who do appeal win their cases at surprisingly high rates."

Getting a health insurance claim denied can feel like a punch to the gut — especially when you're already dealing with a health issue. You followed the rules, you got the care you needed, and now your insurer is refusing to pay. What many people don't realize is that a denial letter is not a dead end. It is an invitation to respond.

Understanding your legal appeal rights is the first step toward reversing a denial and getting the coverage you're entitled to.

Why claims get denied

Insurers deny claims for a wide range of reasons, and not all of them are legitimate or final. Common reasons include:

The service was deemed "not medically necessary" under the insurer's criteria
You saw an out-of-network provider without prior authorization
The claim contained a coding or billing error
The treatment is listed as an exclusion in your plan
Prior authorization was not obtained before the service
The insurer claims the condition is pre-existing (less common after the ACA)

Even if the reason sounds definitive, many denials are successfully overturned on appeal — especially those involving "medical necessity," which is often a judgment call that your doctor is better positioned to make than an insurer's claims reviewer.

Your federal rights under the ACA

The Affordable Care Act significantly expanded consumer protections around insurance appeals. If your plan is an ACA-compliant plan (most employer and marketplace plans are), you have the following legally guaranteed rights:

Right to an internal appeal:You can ask your insurer to reconsider the decision. They must review it and respond within a set timeframe.
Right to an external review:If your internal appeal is denied, an independent third-party organization — not your insurer — reviews the case. Their decision is binding.
Right to expedited review:For urgent or ongoing situations, insurers must process appeals faster — typically within 72 hours.
Right to information:Your insurer must tell you exactly why the claim was denied and what they need to reconsider it.
Right to continued coverage:If you're in the middle of an ongoing treatment, you may be entitled to have coverage continue while your appeal is reviewed.

Important: Deadlines matter. Most insurers require internal appeals to be filed within 180 days of the denial. Missing this window may forfeit your right to appeal. Check your denial letter and Explanation of Benefits (EOB) immediately for specific deadlines.

The appeal process: step by step

Winning an appeal comes down to preparation. Here is how the process typically unfolds:

Step 01

Read the denial carefully

Get the specific reason in writing. Request the full Explanation of Benefits and ask for the clinical criteria used to deny your claim.

Step 02

Gather documentation

Collect your medical records, doctor's notes, referrals, and any prior authorization paperwork. Evidence wins appeals.

Step 03

Get a letter from your doctor

A letter of medical necessity from your treating physician is often the single most powerful piece of evidence in an appeal.

Step 04

Write your appeal letter

Be factual, specific, and professional. Reference your policy language, the denial reason, and the evidence that contradicts it.

Step 05

Submit and document everything

Send your appeal via certified mail or the insurer's secure portal. Keep copies of everything and note dates.

Step 06

Escalate if needed

If the internal appeal fails, request external review. You can also contact your state insurance commissioner for help.

What makes a strong appeal letter

The appeal letter is your most important tool. A vague, emotional, or disorganized letter is easy to dismiss. A clear, evidence-backed letter is much harder to ignore. The best appeal letters share several qualities:

They open by clearly identifying the claim — date of service, claim number, denial reason — so there is no ambiguity about what is being appealed. They cite the specific language of the insurer's denial and then systematically address each point with medical evidence, policy language, and clinical guidelines. And they close with a clear, specific request: to reverse the denial and authorize payment.

Tone matters too. An appeal that reads as professional and informed signals that the writer knows their rights — and that the insurer should take the response seriously.

When to consider additional help

Most straightforward denials can be appealed without professional help, especially with the right template. However, consider involving a patient advocate, healthcare attorney, or your state's insurance department if: the denial involves a large dollar amount, the treatment is time-sensitive, the insurer is unresponsive, or you've been through multiple rounds of denial already.

Your state insurance commissioner's office is a free resource and can apply significant pressure on insurers who are acting in bad faith.

You have more power than you think

Insurance companies count on policyholders accepting denials without question. When you understand your rights and know how to use them, the odds shift considerably in your favor. Studies of external review processes consistently show that patients win a substantial portion of cases — sometimes more than 40% — when they reach independent review.

The system is designed to be navigated. You just need the right tools to navigate it.

Ready to write your appeal?

Appeal Templates provides professionally drafted, condition-specific health insurance appeal letters — built around the language insurers respond to.

Browse appeal templates ↗

Tatiana Kadetskaya

Tatiana Kadetskaya is a life insurance attorney and founder of Kadetskaya Law Firm, LLC, based in King of Prussia, Pennsylvania. Since 2012, she has represented hundreds of beneficiaries and policyowners whose life insurance claims were wrongfully denied or delayed by major insurers including MetLife, Prudential, Unum, Guardian, and others. Her practice covers denied claims, ERISA appeals, beneficiary disputes, interpleader actions, lapsed policy denials, and accidental death claims. She has been quoted in Investopedia and InsuranceNewsNet, and serves as plaintiff's counsel a class action lawsuit in Linhart v. John Hancock Life Insurance Company. Avvo Clients Choice Award 2021 and 2025. Martindale-Hubbell Client Champion. Licensed in Pennsylvania. Languages: English and Russian. Free consultation: (888) 510-2212.

https://life-insurance-lawyer.com