Billing, insurance, & finance
October 6, 2016|Last updated May 5, 2026

Claims processing:

How to write a claim letter

Written by Polina Pak

At a glance

  • Health insurance claim letters are written by claimants to seek reimbursement when a doctor fails to file a medical claim properly.
  • Insurance claim letters must include the claimant's policy number, specific request details, and citations of relevant policy terms.
  • Medical claim submissions require supporting documents such as completed forms, itemized bills, payment receipts, and hospital discharge papers.
  • Health insurance companies typically require the submission of reimbursement claims within seven days of completing medical treatment.
Table Of contents
doctor writing close-up on hand

A health insurance claim letter is a letter a claimant writes to a health insurance company if the claimant’s doctor has not properly filed a medical claim. This letter typically seeks for a reimbursement to the client after the client has already paid their medical bill, per the agreement between the claimant and the insurer. It is only effective if the services in question are covered under the claimant’s insurance, and is not intended to be used to seek reimbursement for items not usually covered.

Who is responsible for submitting the claim letter?

The claimant will be responsible for paying any deductions necessary, and these payments will not be reimbursed. As well, the claimant needs to be aware of all documents and forms that must be included in the claim, and they must correctly fill out and submit these papers. While these may be different from one case (or one insurer) to another, the basic forms should include the following:

  • The completed claim form
  • Any bills for services rendered such as prescriptions, treatments, or tests
  • Receipts for medical bills
  • Hospital discharge papers
  • Surgeon’s bill (if relevant)

If your insurer requires original copies of these documents, it’s wise to retain copies. Any additional documents supporting the claim may be helpful even if they are not strictly necessary.

The letter itself should be short and contain only the details of your request and your insurance policy number. The letter should cite the terms of the policy that apply to claim. Most insurers require that you submit these claims within 7 days of completion of treatment, so timely submission is important.