Denials feel random until you sort them by reason code. Then a pattern appears: most fall into four buckets, and each bucket has an upstream fix. Here are the ten most common, grouped by where the real problem lives.
Eligibility and coverage.
1) Patient not active on the date of service. 2) Wrong plan billed as primary. 3) Coordination-of-benefits not on file. All three trace back to verification, not billing — the fix is confirming coverage and order of benefits before the visit, covered in the verification guide.
Documentation and attachments.
4) Missing X-rays or perio charting. 5) No narrative on a procedure that needs one. 6) Attachment doesn't support the code billed. These are the easiest to prevent: build a rule that high-value procedures don't submit without their required attachments.
A first-pass acceptance rate above 95% is achievable when eligibility and attachments are handled before submission. Below that, the fix is upstream — not more appeal capacity.
Coding and plan rules.
7) Downgrades and alternate-benefit provisions. 8) Frequency limitation exceeded. 9) Pre-authorization required but not obtained. These come from plan setup and treatment planning — flag the rules during verification so the front office quotes and schedules around them.
Process.
10) Timely filing blown. The most avoidable denial of all — a claim that would have paid, lost to the clock. Same-day submission and daily AR follow-up close this gap. The prevention playbook is in how to reduce dental claim denials, and it's core to our dental billing and RCM service. Not sure where your denials cluster? Book a call.