[Insurance Company Name][Insurance Company Address][City, State, ZIP]Re:Patient: [Patient’s Full Name]Policy/Subscriber ID #: [Policy Number]Date of Birth: [DOB]Dear [Insurance Company Contact or Claims Department],I am writing to formally appeal the denial of coverage for [treatment, medication, or service] as stated in your letter dated [date of denial letter]. According to the denial letter, the claim was denied because [insert specific reason stated by the insurer].I disagree with this decision. [Explain why you believe the claim should be approved, including any medical evidence, doctor’s recommendations, or policy terms supporting coverage.] For example, my healthcare provider has confirmed that this treatment is medically necessary for my condition, and all services were provided in compliance with policy guidelines.I respectfully request a thorough review of my claim and reconsideration of your decision. I have attached supporting documents including medical records and letters from my healthcare provider.Please contact mè at [phone number] or [email] if further information is needed. I appreciate your prompt attention to this matter.Sincerely,[Your Full Name][Your Address][Your Contact Information]