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How to appeal a Aetna denial

Sarah Chen, RN-BSN, CPCSarah leads InsureDefense's clinical review. 12 years working appeals at a major US payer plus 4 years as a patient advocate.

About Aetna

Owned by CVS Health since 2018.

Step-by-step appeal process for Aetna

  1. Read your denial letter. Look for the denial reason code (often a CARC code), the denied amount, the specific service in question, and the appeal deadline.
  2. Identify the denial category. Common categories include administrative, prior authorization, medical necessity, plan exclusion, and out-of-network. The category drives what evidence will help.
  3. Gather your evidence. For medical-necessity denials, a treating-provider letter is the most important piece. For prior-authorization denials, documentation that the process was attempted or that urgent circumstances applied.
  4. Write a structured appeal letter. Identify the claim, respond to the stated denial reason, cite plan language where applicable, and make a clear request for specific relief.
  5. Submit by the deadline. Most Aetna plans accept appeals by fax, mail, or member portal. The fax option is fastest. Keep your transmission confirmation.
  6. Follow up. Federal rules requireAetna to decide internal appeals within 30 days for pre-service claims and 60 days for post-service claims (72 hours for expedited).

Common Aetna denial categories

  • Prior authorization absent — service required prior approval that wasn’t obtained.
  • Not medically necessary — clinical reviewer concluded the service wasn’t needed based on the information they had.
  • Excluded under the plan — the plan’s terms specifically exclude the service.
  • Out-of-network — provider was outside the network. Surprise-billing protections may apply.
  • Experimental or investigational — treatment considered not yet proven for the indication.

What InsureDefense adds for Aetna appeals

We prepare a professionally-structured appeal letter within 24 hours (12 hours for urgent cases). Premium-tier appeals include citations to specific Aetna plan-document sections where applicable, plus peer-reviewed support for medical-necessity arguments. Every appeal is reviewed by a named medical-claims specialist before delivery.

Upload your Aetna denial See pricing

Frequently asked questions

How long do I have to appeal a Aetna denial?
Under federal law, you generally have 180 days from the date you received the denial notice. The exact deadline is listed on the denial letter. Some Aetna plans may allow longer windows — read the appeal-rights notice carefully.
What's the fastest way to submit a Aetna appeal?
Most Aetna plans accept appeals by fax, mail, and member portal. The fax option is usually the fastest with a confirmation receipt. Your denial letter will list the specific appeals fax number and mailing address for your plan.
Does Aetna ever expedite an appeal?
Yes. If waiting for the standard timeline could jeopardize your health, you can request an expedited appeal, which under federal rules must be decided within 72 hours. Mark your appeal cover letter "REQUEST FOR EXPEDITED APPEAL" and state the urgent circumstances.
What if my Aetna internal appeal is denied?
You generally have the right to external review by an Independent Review Organization (IRO). The IRO is independent of Aetna, and its decision is binding. Your final internal denial notice will explain how to request external review and state the deadline.
Not legal, medical, or insurance advice.

InsureDefense is not a law firm, insurer, medical provider, or claims adjuster. We do not provide legal, medical, or insurance advice. We prepare appeal documents based on the information you provide. We do not guarantee approval, payment, coverage, or reimbursement. For urgent medical situations, contact your doctor, insurer, or emergency services directly.