Medical Billing Appeal Letter Templates

Pre-written appeal letter templates for the most common medical billing denial categories. Each template includes the applicable regulatory citation, the legal standard the payer must meet when adjudicating the appeal, and placeholder instructions for inserting claim-specific clinical and administrative details. Templates are formatted for direct submission — address block, reference line, regulatory basis, and supporting documentation checklist included.

Template categories: medical necessity (CO-50, CO-11) — cites applicable LCD or NCD coverage criteria and clinical society guidelines; prior authorization denial (CO-15, N265) — cites ACA §2719, ERISA §503, or 42 CFR §422.566 depending on payer type; timely filing with proof of submission (CO-29) — includes clearinghouse acceptance timestamp documentation instructions; coordination of benefits (CO-22) — includes primary EOB attachment instructions and secondary billing calculation; bundling dispute (CO-97, CO-4) — cites CMS NCCI edit policy manual and modifier documentation requirements; non-covered service dispute (CO-96) — cites plan benefit exclusion review rights under ERISA §502 or ACA external review.

For jurisdiction-specific appeal letters with payer type routing (Medicare, Medicare Advantage, ERISA, fully-insured commercial, Medicaid) and state-specific prompt pay statute citations, use the Appeal Letter Builder which generates a complete letter from your denial code and clinical details.

• Appeal Letter Builder — generates a complete jurisdiction-specific letter
• Denial Decoder — identify the correct appeal path before selecting a template
• Clinical evidence references for medical necessity templates