7 Common Reasons Health Insurance Claims Are Denied, and How to Reverse Them

When you receive a denial letter, it can be overwhelming, and it’s essential to act promptly. Understanding the common reasons for claim denials empowers you to act before an appeal is necessary. Here are the top seven reasons claims are denied, what each means, and how you can effectively respond.

1. Administrative Errors

What it is: Mistakes like wrong patient name, incorrect insurance ID, expired coverage, or coding errors.
Frequency: According to the Kaiser Family Foundation (KFF), administrative issues account for 18% of denials, as reported in recent data from the ACA marketplace.
How to fix it:

• Carefully review your Explanation of Benefits (EOB) for errors.
• Resubmit the claim with correct demographics or coding, with a note: “Please update and resubmit.”

2. Excluded Services or Benefits

What it is: Insurers deny claims for treatments not covered under your policy.
Frequency: Roughly 16% of marketplace in-network denials come from excluded services, according to the Kaiser Family Foundation.
How to fix it:

• Check your policy documents (“Evidence of Coverage”) for coverage terms.
• If the medical need isn’t explicitly excluded, file an appeal citing ambiguity and attach relevant clinical guidelines.

3. Lack of Prior Authorization or Referral

What it is: Your provider didn’t obtain advance approval.
Frequency: about 9–10% of denials fall into this category. (KFF).
How to fix it:

• Obtain retroactive authorization immediately through your provider.
• In your appeal, include the authorization and a doctor’s note stating the urgency of care.

4. Medical Necessity

What it is: Insurers consider the service “not medically necessary.”
Frequency: According to Healthcare.gov, this reason is cited in about 6% of marketplace denials.
How to fix it:

• Collect supporting evidence: doctors’ notes, test results, peer-reviewed guidelines.
• Submit an appeal letter stating: “Clinical necessity met as per [source], see attached documentation.”

5. Benefit Limits or Caps

What it is: You’ve reached plan limits (e.g., number of visits or dollar cap).
Frequency: In 2023, exceeded benefits represent about 12% of denials. (HealthCare.gov).
How to fix it:

• Review policy limits for services or out-of-pocket caps.
• If limits are unclear, ask for a policyholder’s statement and submit an appeal citing the ambiguity.

6. Other / Miscellaneous

What it is: Denials under vague “other” categories.
Frequency: The largest single group, 34%, of in-network marketplace denials. (KFF, insurance.ky.gov).
How to fix it:

• Ask for specific clarification from the insurer.
• Respond in your appeal: “Please specify the reason for denial,” and submit documentation to support your case.

7. Complex Denials: Pre-Approved, But Later Denied

What it is: Claims pre-authorized but later denied, often after retroactive medical review.
Frequency: Nearly 15–16% of claims are denied even after pre-approval. (KFF).
How to fix it:

• Keep all documentation of prior authorizations.
• In your appeal, stress the prior approval and include approval ID, date, and the provider’s statement confirming the pre-approval.

What You Can Do Right Now

• Carefully review your EOB/denial letter for the exact reason.
• Gather relevant documents: policy pages, medical records, and authorizations.
• Write an appeal letter that directly responds to the insurer’s reason, supported with evidence.
• Submit promptly: deadlines vary, but most plans give 30–60 days.
• If denied again, escalate to an external or independent review under Kentucky or Ohio insurance law.

Why This Matters in Kentucky & Ohio

• Kentucky consumers have the right to an external independent review, which requires insurers to inform you about this option. (insurance.ky.gov).
• Ohio offers similar protections through OSHIIP (Ohio Senior Health Insurance Information Program). (insurance.ky.gov).

Final Takeaway

While administrative errors and missing authorizations are the most common reasons for denials, many denials also come from unclear sources. Yet, many denial can be reversed with a well-prepared appeal. Seeking professional legal assistance can significantly enhance your chances of overturning the denial. Don’t underestimate the power of a precise, evidence-based argument.

If you’re in Kentucky or Ohio and need help appealing your denial, AppealHealthcare.com can assist. We offer free case reviews and guidance throughout every step of the appeal process.

Sources:
Data and statistics are sourced from the KFF HealthCare.gov analysis (KFF) and Experian’s State of Claims reports (experian.com). More insights on prevalence and overturn rates come from reports by STAT and the American Hospital Association (AHA). Information regarding state-specific appeal processes can be found in the historical PDF from the Kentucky Department of Insurance.

Attorney Advertising. This page provides general information. It is not legal advice and does not create an attorney-client relationship. Every situation is fact-specific. Do not rely on this content without advice from a lawyer who knows your facts. Past results do not predict future results.

Responsible lawyer and office address: Frank M. Mungo Attorney at Law, 7310 Turfway Road, Suite 550, Florence, Kentucky 41042. Mr. Mungo is licensed in Kentucky and Ohio. (insurance.ky.gov) and SHIP information for Ohio and Kentucky (insurance.ky.gov).