Choose the denial code and payer, add the claim details, and get an editable appeal letter in about 60 seconds.
How to use the appeal letter generator
- Pick the denial code. Search by number or keyword (for example 97, CO-50 or auth). The tool sets a matching argument type and links the code guide.
- Add the payer, plan type and appeal level. For Original Medicare the letter switches to reopening, redetermination or reconsideration wording.
- Fill in the provider, patient and claim details. Use the remittance (835/ERA or EOB) for the claim number, denial date and amounts.
- Tick the arguments that are true for this claim. Each one adds a paragraph. Add case-specific facts in Additional details.
- Check the enclosures. The tool suggests documents for each argument; untick anything you aren’t sending.
- Copy, download (.docx) or print. Replace every [bracketed] item, review the letter against the medical record, sign it and send it the way the payer requires.
What a strong appeal letter includes
- Identifiers the payer needs to find the claim: patient name, member ID, date of birth, claim number, date(s) of service and the billing NPI.
- The exact denial reason from the remittance: group code, CARC and any remark code (RARC).
- A short factual argument tied to documentation, not opinion. One clear reason beats five vague ones.
- A specific request (reprocess and pay the claim) and a contact for questions.
- The supporting documents, listed as enclosures, and a copy of the denial.
Before you appeal, confirm it’s a denial and not a rejection or an unprocessable claim. If the claim had a fixable error, a corrected claim is often faster. See denial codes for code-by-code fixes, and check your filing window with the Timely Filing & Appeal Deadline Calculator.
Frequently asked questions
Is this appeal letter generator free?
Yes. It’s free, needs no sign-up, and you can download as many letters as you need.
Is the information I type saved or sent anywhere?
No. The letter is built in your browser. Nothing you type is stored, sent to a server or saved in your browser. If you’re unsure, use de-identified or sample data and add patient details in your own system.
Which denial codes does it cover?
More than 50 common Claim Adjustment Reason Codes (CARCs), including every code that has a guide on Medical Billing 101, such as CO-16, CO-29, CO-50, CO-97, CO-197 and OA-18. Each code is matched to an argument type such as medical necessity, timely filing, duplicate, bundling or modifier, eligibility, prior authorization, coordination of benefits or missing information.
Should I send an appeal or a corrected claim?
If the denial was caused by an error you can fix, such as a missing modifier, an invalid code or a wrong member ID, a corrected claim is usually the faster route. Appeal when the claim was correct and you disagree with the payer’s decision. For Original Medicare, a claim returned as unprocessable has no appeal rights; correct it and submit a new claim.
What should I include with an appeal letter?
Usually a copy of the denial (EOB or remittance), a copy of the claim, and the documents that prove your argument, such as visit notes, an operative report, the authorization approval, proof of timely filing or the primary payer’s EOB. Follow the payer’s instructions for its appeal form, address and required documents.
Can I use it for Original Medicare appeals?
Yes. Choose Original Medicare as the plan type and the letter uses Medicare terms: a reopening for clerical errors, a redetermination by the Medicare Administrative Contractor, or a reconsideration by the Qualified Independent Contractor. A redetermination request must include the beneficiary’s name, Medicare number, the items or services and dates being appealed, and the name and signature of the person requesting it (42 CFR 405.944). You can also use form CMS-20027.
How long do I have to file an appeal?
It depends on the payer. For Original Medicare, a redetermination must be requested within 120 days of receiving the initial determination, and receipt is presumed 5 days after the date on the notice. Commercial and Medicaid deadlines are set by the contract, plan or state. Use the Timely Filing & Appeal Deadline Calculator to work out the date.
Sources
- X12, Claim Adjustment Reason Codes
- eCFR, 42 CFR 405.942 and 405.944 (Medicare redetermination)
- CMS, Medicare Parts A & B appeals process
