Undeny

AI denial appeal letter generator

Enter the denial code and payer to get a payer-ready letter. Patient details stay as placeholders, and nothing you type is stored.

Don't enter patient names, DOB, or member IDs. The letter uses placeholders you fill in after copying. How we handle data

Example output for CO-97 · Aetna · CPT 97140. Yours appears here.

Aetna

[Address of Aetna Claims Department]

RE: Appeal for Claim [Claim Number]

Patient: [Patient Name] · Member ID: [Member ID]

Date of Service: [Date of Service] · CPT Code: 97140

I am writing to formally appeal the denial of claim [Claim Number] for services rendered to [Patient Name]. The claim was denied under code CO-97, indicating that the services were considered to be part of a bundled service.

The manual therapy provided was performed on a separate body region from the therapeutic exercise, which justifies the need for distinct billing…

Informational only - not legal, medical, or billing advice. Always verify against current payer policy before submitting.

Questions billers ask

Something else? Email hello@undeny.ai.

Is the appeal letter generator free?

Yes - it's completely free with no login or credit card. Generate as many payer-ready appeal letters as you need.

Does it store patient information (PHI)?

No. The generator never asks for or stores patient names, dates of birth, or member IDs. It produces a letter with bracketed placeholders you fill in locally.

Which denial codes and payers does it work with?

Any CARC/RARC denial code (for example CO-45, CO-97, or PR-204) and any payer such as Aetna, Cigna, UnitedHealthcare, or Blue Cross Blue Shield. Always verify the final letter against current payer policy before submitting.

Imagine this for every denial

Undeny's full platform pulls denials straight from your clearinghouse and drafts appeals automatically. Join the waitlist for early access.

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  • First access to the agent

    Onboarding starts with the first 100 practices, in the order they join.

  • A free denial audit

    We'll show you what's recoverable in your recent remits, before you pay anything.

  • Founding pricing, locked in

    Flat monthly pricing, set before public rates. Never a cut of collections.

  • A direct line to the team

    Tell us your payers and workflows; we build for them first.