Blog · Denials ·
The 10 most common reasons claims get denied (and how to prevent them)
Most claim denials are not mysterious. They come from a short list of causes, and most of those causes can be caught before the claim is sent. Below are ten of the most common, with a practical prevention step for each.
1. Eligibility or coverage issues
The patient's coverage ended, changed or never covered the service. Prevention: verify eligibility before every visit, not just the first one. Coverage changes more often than most front desks expect.
2. Missing or expired prior authorization
Some services need approval before they are performed. Prevention: keep a simple list of services that need authorization for each major payer, and track authorization dates and visit counts.
3. Incomplete or incorrect patient information
A wrong date of birth, a misspelled name or an old member ID can stop a claim. Prevention: scan the insurance card at every visit and compare it with what is in the system.
4. Duplicate claims
Sending the same claim twice usually leads to a denial on the second one. Prevention: check claim status before resubmitting, and use corrected-claim indicators when you are fixing a claim.
5. Timely filing limits missed
Every payer sets a deadline to submit claims. Prevention: know each major payer's limit and submit claims within a few days of the visit.
6. Coding errors
Codes that do not match the documentation, outdated codes or the wrong number of units. Prevention: a short pre-submission coding review, especially for high-value or unusual services.
7. Missing or incorrect modifiers
Modifiers tell the payer why a service is different. Leaving one off can trigger a bundling denial. Prevention: build modifier rules for your common scenarios into charge review.
8. Diagnosis does not support medical necessity
The diagnosis code on the claim does not justify the service. Prevention: check that every procedure is linked to a diagnosis that supports it.
9. Provider not credentialed or enrolled
The rendering provider is not active with the payer. Prevention: track enrollment status for every provider and payer, and do not schedule new providers with a payer until enrollment is confirmed.
10. Coordination of benefits
The payer believes another plan should pay first. Prevention: ask about other coverage at check-in and update coordination of benefits when patients report a change.
Build a feedback loop
Fixing denials one by one is necessary, but the bigger gain comes from asking why each denial happened and fixing the cause. Review your top denial reasons every month, assign one prevention step to each, and check the next month whether it worked.