Top 10 Reasons Medical Claims Get Denied (and How to Avoid Them)

Medical claim denials are a major headache for healthcare providers. According to the American Medical Association (AMA), nearly 20% of claims are initially denied, costing practices time, money, and resources to correct errors. Understanding why claims get rejected and how to prevent these issues can save your practice thousands of dollars annually.

In this guide, we’ll break down the top 10 reasons medical claims are denied and provide proven solutions to help you avoid costly mistakes.


1. Incorrect or Incomplete Patient Information

Even minor typos in a patient’s name, date of birth, insurance ID, or policy number can trigger an automatic denial.

How to Avoid It:

  • Double-check patient demographics during registration.
  • Use electronic health record (EHR) systems with insurance verification tools.
  • Train staff to confirm details at every patient visit.

2. Coding Errors (ICD-10, CPT, or HCPCS)

Using outdated, mismatched, or unspecified codes is a leading cause of denials. For example, a missing modifier or incorrect ICD-10 code for a diagnosis can derail a claim.

How to Avoid It:

  • Stay updated on annual coding changes (e.g., ICD-10-CM updates).
  • Audit charts regularly for coding accuracy.
  • Invest in certified coders or AI-powered coding software.

3. Missing Prior Authorization

Many insurers require pre-authorization for specific procedures, tests, or medications. Skipping this step guarantees a denial.

How to Avoid It:

  • Create a checklist of services requiring prior authorization.
  • Use payer-specific portals to track approvals in real-time.

4. Claim Submission Deadlines Missed

Most insurers enforce strict deadlines (e.g., 90–180 days from the date of service). Late submissions lead to automatic rejections.

How to Avoid It:

  • Implement a claims tracking system with deadline alerts.
  • Submit claims within 48–72 hours of service.

5. Duplicate Claims

Accidentally submitting the same claim twice—or failing to confirm if a claim was already processed—can flag your practice for fraud.

How to Avoid It:

  • Use billing software that detects duplicates.
  • Communicate with payers if a claim’s status is unclear.

6. Non-Covered Services

If a service isn’t covered under a patient’s plan (e.g., experimental treatments), the claim will be denied.

How to Avoid It:

  • Verify insurance coverage and benefits before providing services.
  • Educate patients about potential out-of-pocket costs upfront.

7. Incorrect Provider Information

Mismatched NPIs, outdated credentials, or incorrect group practice details can invalidate a claim.

How to Avoid It:

  • Maintain a centralized database of provider information.
  • Regularly update payer contracts and enrollment forms.

8. Insufficient Documentation

Payers often deny claims due to missing operative reports, progress notes, or proof of medical necessity.

How to Avoid It:

  • Follow payer-specific documentation guidelines.
  • Use EHR templates to standardize record-keeping.

9. Eligibility Issues

Claims are denied if a patient’s coverage was inactive on the date of service.

How to Avoid It:

  • Automate eligibility checks before appointments.
  • Reverify coverage for recurring patients.

10. Upcoding or Downcoding

Billing for a higher (upcoding) or lower (downcoding) level of service than provided can lead to audits and denials.

How to Avoid It:

  • Train providers on accurate documentation of service complexity.
  • Conduct internal audits to catch coding discrepancies.

How to Reduce Denials and Improve Revenue Cycle Management

While avoiding these errors is critical, managing denials proactively is equally important:

  1. Analyze Denial Trends: Use analytics to identify recurring issues (e.g., which codes or payers cause the most denials).
  2. Appeal Strategically: Prioritize high-value denials and submit appeals with corrected documentation.
  3. Outsource to Experts: Partnering with a medical billing service ensures claims are coded, submitted, and tracked accurately the first time.

Final Thoughts

Reducing claim denials requires a mix of staff training, technology, and attention to detail. By addressing these 10 common pitfalls, you can streamline your revenue cycle, boost cash flow, and focus on what matters most: patient care.

Billopt specializes in minimizing denials and maximizing reimbursements for healthcare providers. Schedule a free audit today to see how we can optimize your billing process!

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