How to Appeal a Health Insurance Denial

Confirm the process before writing

Read the denial’s appeal instructions and the relevant plan documents. Confirm the submission channel, deadline, required forms, and any representative authorization. Ask whether your provider’s appeal is separate from your own. Medicare and Medicaid use their own procedures.

References: HealthCare.gov: Internal appeals · U.S. Department of Labor: Filing a claim for your health benefits

Build a focused appeal packet

Organize the material so the reviewer can connect each fact to the disputed decision. Keep originals and send copies through the approved channel.

• Denial notice and EOB, with the claim number clearly identified.
• Patient and member identifiers, service date, and provider.
• A short explanation of what should be reconsidered and why.
• Relevant clinical records or a treating clinician’s letter when the issue is clinical.
• Authorization records, corrected billing details, or coverage documents that answer the denial.

Map each denial reason to one piece of evidence

Make a three-column outline before drafting: the plan’s reason, the fact you dispute, and the document supporting your answer. If you cannot fill the evidence column, that identifies the next record to request. More pages are not automatically a stronger appeal.

• Coverage was inactive → identify the disputed coverage date → attach the relevant enrollment or coverage confirmation.
• Authorization was missing → identify the matching approval → attach the approval with service and date details.
• Clinical documentation was insufficient → ask the treating clinician what evidence answers the stated concern → attach relevant records and an explanation.
• The claim describes the wrong service → request a provider accuracy review → confirm whether a corrected claim or a separate member appeal is required.

Ask for a specific outcome

State whether you want a claim reprocessed, a service authorized, or a patient balance corrected. Explain how your evidence addresses the plan’s reason. Do not add diagnoses or events that are not supported by the records. Use the letter template in the related guides as a starting point, then adapt it.

Worked example: a short appeal opening

Illustrative drafting example only. not a patient outcome or a guarantee of coverage. Suppose a denial says a required authorization was absent, but you hold an approval that appears to match the claim. An opening could read:

“I request reconsideration of claim [number] for [service] on [date]. Your notice dated [date] states that authorization was missing. The attached approval [reference] lists [matching service, provider, and dates]. Please review this approval against the submitted claim and explain any remaining mismatch. I request reprocessing under my plan’s applicable benefits and a written decision.”

Use this wording only when the facts are true. If the approval does not match, describe the discrepancy honestly. Replace every bracket, attach the referenced document, and include any required plan form. A clinical denial needs a different explanation and appropriate clinician evidence.

Submit, confirm, and follow up

Save a portal receipt, fax confirmation, or tracked mailing record. Ask the plan to confirm receipt, the appeal reference number, and the expected decision date. If it requests more information, record the request and response. Do not assume a billing hold or deadline extension has been granted.

Read the next decision carefully

If the appeal is denied, review the next-level instructions. Some decisions qualify for independent external review; eligibility and the process depend on the plan and issue. Ask about expedited procedures when a delay could seriously endanger health.

References: HealthCare.gov: External review

Keep a receipt and an escalation plan

Create one appeal log with the submission date, channel, reference number, documents included, and the decision date the plan provides. If a portal only says “message sent,” ask whether the plan registered a formal appeal. Save the answer.

When a decision arrives, compare it with each issue you raised. If it remains adverse, read the next-step notice and identify which issues are eligible for another review. Ask for help understanding the applicable process rather than sending the same packet indefinitely.

• Before submission: check required forms, representative authorization, identifiers, attachments, and the applicable deadline.
• After submission: confirm receipt and whether anything is missing.
• Before the expected decision date: keep a reminder and the plan’s contact reference.
• After the decision: record the outcome, any next-level deadline, and whether the provider balance changed.