Why Are My Insurance Claims Getting Denied?
Claim denials are frustrating precisely because they feel random. A claim you’ve submitted dozens of times before suddenly comes back denied, with a vague code and no clear explanation.
They’re not random. Almost every denial has a specific cause, and most of those causes are fixable.
The most common denial reasons
1. Patient eligibility issues
This is the number one cause of preventable denials. The patient’s insurance coverage lapsed, they switched plans, or the information on file doesn’t match what the payer has. If you don’t verify eligibility before every visit, you’ll bill claims to the wrong payer or to a plan that’s no longer active.
Fix: Verify patient eligibility in real time before each appointment, not just at registration.
2. Wrong or incomplete codes
An ICD-10 diagnosis code that doesn’t match the CPT procedure code, a missing modifier, a code that’s been discontinued: all of these get a claim kicked back. Coding errors are responsible for roughly 12% of all claim denials nationally.
Fix: Use a billing team that’s current on coding guidelines and does a pre-submission review of every claim.
3. Missing or incorrect patient information
Wrong date of birth, misspelled name, incorrect insurance ID number. These seem like minor errors, but they prevent a claim from being matched to the right patient record in the payer’s system.
Fix: Confirm patient demographic information at every visit, not just at initial registration.
4. Duplicate claims
If the same claim gets submitted twice, the second one is denied as a duplicate. This often happens during billing system transitions or when a staff member resubmits a claim that was never actually rejected.
Fix: Maintain a clear claim tracking log and check the status of a claim before resubmitting.
5. No prior authorization
Many procedures require payer approval before you perform them. If that approval wasn’t obtained, or if it expired before the service was delivered, the claim will be denied on medical necessity or authorization grounds.
Fix: Build prior authorization tracking into your scheduling workflow, not as an afterthought.
6. Timely filing
Every payer has a deadline for submitting claims after the date of service, often 90 days, sometimes up to a year. Miss the window and the denial is almost never overturned.
Fix: Submit claims within 24 to 48 hours of service delivery.
7. Medical necessity denials
The payer doesn’t believe the service was medically necessary based on the documentation. This is the hardest denial to fight because it requires clinical justification.
Fix: Make sure documentation clearly supports the diagnosis and the service provided. Diagnosis codes should reflect the full clinical picture.
What happens to most denied claims?
About 65% of denied claims are never appealed. They just get written off. That’s the real cost: not the denied claim itself, but the revenue that walks out the door because nobody fought for it.
FluxCura’s denial management team handles the whole appeal process so denied revenue comes back to your practice. Learn more about FluxCura’s Denial Mangement.
