Answer

Why was my claim denied?

The short answer

A denial means your plan decided not to pay for some or all of a claim. The reason matters. Some denials are fixed when the provider corrects and resends the claim. Others need an appeal, which asks the plan to review its decision. Your notice should say which.

Key takeaways

  • Start with the reason on the notice or EOB. It points to the right next step.
  • Coding errors and missing details are often fixed by the provider's billing office, not by an appeal.
  • Coverage decisions, such as "not medically necessary," usually need an appeal with supporting records.

What you can do next

  1. Find the denial reason and any code on your notice or EOB.
  2. Call the provider's billing office and ask: "Can this be corrected and resubmitted?"
  3. If it is a coverage decision, open the appeal checklist and note your deadline.

Read the full lesson

Words in this lesson

Denial
A decision by your plan not to pay for all or part of a claim or a request for care. The notice should explain why.
Claim
A request for payment sent to your health plan, usually by your provider, after you get care.
Medically necessary
Care your plan agrees is needed to diagnose or treat a health condition, based on its rules. Plans may deny care they consider not medically necessary.
Prior authorization
Your plan's approval before certain care. Approval is not a guarantee of payment.
Appeal
A formal request asking your plan to review and change a decision, such as a denied claim or prior authorization.

Related

This is general education. For decisions about your own plan, taxes, or legal rights, check your plan documents or a qualified professional.

Sources

  1. Filing a Claim for Your Health Benefits U.S. Department of Labor, Employee Benefits Security Administration. Applies to: current page. Published or updated: Unknown. Retrieved: October 14, 2026.
  2. Internal appeals HealthCare.gov (Centers for Medicare & Medicaid Services). Applies to: current page. Published or updated: Unknown. Retrieved: October 14, 2026.
  3. Claims Denials and Appeals in ACA Marketplace Plans in 2024 KFF (independent analysis). Applies to: 2024 plan year data. Published or updated: Unknown. Retrieved: October 14, 2026.
  4. Transparency in Coverage public use files Centers for Medicare & Medicaid Services. Applies to: 2024 plan year. Published or updated: Unknown. Retrieved: .