Notes on payer behavior
Appeal letter for a denied medical claim: four templates, by denial type
A good appeal letter is short, specific, and attached to the document that decides it. Payers process thousands a week. The ones that reverse fast make the reviewer's job easy: claim number, what happened, what you're asking for, evidence stapled. Below are four templates that cover most provider-side denials. Adjust the bracketed parts, keep everything else short.
What every letter needs
- Identifiers on every page. Claim number, patient ID, date of service, provider NPI and tax ID.
- The denial, quoted. The reason code and remark code, and the date of the remittance.
- One paragraph of what happened. No history of the relationship, no adjectives.
- The ask. Reprocess, reconsider, or pay the difference. Say which.
- Attachments, listed. The reviewer should never have to look for anything.
Template 1: timely filing, with proof
Subject: Request for reconsideration, timely filing denial, claim [number]
Claim [number] for [patient ID], date of service [date], was denied on [remittance date] with reason code CO-29. Our records show the claim was accepted by [payer or clearinghouse] on [date], [N] days after the date of service and inside the [N]-day filing limit under our agreement. The claim-level acceptance report is attached. Please reprocess the claim for payment.
Attachments: 277CA or clearinghouse acceptance report showing claim-level acceptance and date; original claim.
Use claim-level proof only. A batch acknowledgment proves a file arrived, not that this claim was in it. The proof hierarchy, and the Medicare exception.
Template 2: authorization was on file
Subject: Request for reconsideration, authorization on file, claim [number]
Claim [number] for [patient ID], date of service [date], was denied with reason code CO-197 (authorization absent). Authorization [number] was issued by [payer] on [date] for [CPT codes], valid [date range], [units]. The service billed matches the authorization in code, date, and units. A copy of the authorization is attached. Please reprocess the claim for payment.
Attachments: authorization confirmation; claim.
If the authorization's codes or units don't match the claim, say what changed and why before the payer does. The three-way triage.
Template 3: underpayment against the contracted rate
Subject: Request for reprocessing, underpayment against contracted rate, claim [number]
Claim [number] for [patient ID], date of service [date], CPT [code], was allowed at $[amount] on [remittance date]. The contracted rate for this code under our agreement effective [date], [exhibit or fee schedule reference], is $[amount]. Please reprocess at the contracted rate and remit the difference of $[amount]. [Florida fully insured plans: with 12 percent simple interest under section 627.6131(7), Florida Statutes.]
Attachments: remittance line; contract fee schedule page with the code highlighted; claim list if more than one.
Send one letter per pattern, not per claim. Every line from that payer, that code, that quarter, in one list. The six steps.
Template 4: medical necessity, with the record
Subject: Appeal of medical necessity denial, claim [number]
Claim [number] for [patient ID], date of service [date], CPT [code], was denied with reason code CO-50. The service was medically necessary for [diagnosis, ICD-10 code], which is a covered indication under [payer policy name and number, or LCD number]. The clinical documentation attached shows [the specific findings the policy requires: failed conservative treatment, imaging results, functional limitation]. We request that the denial be overturned and the claim paid.
Attachments: physician's note for the date of service; relevant prior records; the payer policy page with the covered indication highlighted.
Signed by the treating physician.
This is the one letter that argues. It works when the chart supports a covered indication. It does not work, and shouldn't be sent, when it doesn't. How to tell a policy mismatch from a real dispute.
Where to send it, and when
Reconsideration first, formal appeal second, and through the payer's portal when it has one, because the portal timestamps receipt. Contract disputes often have their own address in the provider manual; a contract letter sent to the medical appeals queue can sit for months. Every payer has a window, commonly 90 to 180 days from the denial, and a few have one combined window for both levels. The deadlines by payer.
What not to write
Don't explain how hard your staff works. Don't cite the relationship. Don't threaten. Don't attach a cover letter to a letter. A math problem with the answer stapled to it reverses. A grievance gets filed.
Questions people ask
How do you write an appeal letter for a denied medical claim?
State the claim identifiers, quote the denial code, explain in one paragraph what the payer got wrong, ask for a specific action, and attach the document that proves it. Keep it to a page.
What should be attached to an appeal letter?
Whatever decides the denial: claim-level acceptance proof for timely filing, the authorization for CO-197, the contract fee schedule page for underpayment, the physician's note and the payer policy for medical necessity.
Should the physician sign the appeal letter?
Only for clinical appeals such as medical necessity. Administrative reconsiderations (timely filing, authorization, contract rate) are sent by the billing office or the practice's authorized representative.