Appeal Letter for Denied Medical Claim

The Letter That Starts Your Appeal

An appeal letter is the formal document that triggers the payer's internal review process. It is not optional — phone calls to member services do not start an appeal clock or create a review record. Your letter must be in writing, identify the specific claim and denial reason, and request reprocessing. Without it, you have no standing to escalate to second-level or external review.

Essential Sections of Your Appeal Letter

Open with claim identification: patient name, member ID, claim number, date of service, and billed amount. State the denial reason exactly as it appears on your EOB, including the CARC code. Present your rebuttal in clear, numbered points connecting evidence to the denial reason. List every attached document. Close with a direct request to reprocess the claim and issue payment, plus your contact information for follow-up.

Attachments That Strengthen Your Letter

• Denial letter or EOB showing the reason code and denied amount
• Medical records supporting the service if denied for medical necessity
• Authorization approval letter if denied for missing precertification
• Clearinghouse submission report if denied for timely filing

Submit and Confirm Receipt

Send your appeal letter and attachments using the method specified on your denial notice. Portal submissions typically provide instant confirmation. Fax submissions need a transmission report. Mail submissions should use certified mail with return receipt. Save your confirmation — if the payer claims they never received your appeal, your proof of submission is the difference between a valid appeal and a missed deadline.