Denials are a symptom
The target is a denial rate under 5%. Getting there means treating each denial as evidence: a denial in stage 07 is usually a mistake made in stage 01, and appealing it without fixing the cause guarantees the next one.
Denial management has two jobs. The first is recovery — getting the denied claim paid, by correcting it or appealing it before the payer's deadline. The second is prevention — finding out which step produced the denial and changing that step so the same denial stops arriving. Most billing teams only have time for the first. We do both, because the second is what moves the denial rate.
Denial management services, step by step
Every denial reaches us from the remittance — either the electronic ERA or a paper EOB — during payment posting. From there it follows the same path every time:
- Read: the claim adjustment reason code (CARC) and remark codes say why the payer refused, and the group code (CO, PR, OA) says who is responsible
- Sort: the denial is classed as correctable (fix and resubmit), appealable (argue it with documentation) or a genuine write-off
- Act: corrected claims go back the same day; appeals are written with the note, the authorization and the payer's own policy attached
- Track: every appeal has an owner, a deadline and a follow-up date, and the payer is called until a decision lands
- Trace: the denial is tagged to the stage that caused it — eligibility, authorization, intake, coding or submission
- Fix: recurring causes are changed at the source and reported monthly, by payer
Common denial codes and what they usually mean
Most denials fall into a handful of reason codes. Each points back to a specific stage of the revenue cycle:
- CO-16 — missing or invalid information: usually registration data or a documentation detail on an add-on code
- CO-27 — coverage terminated: eligibility wasn't re-checked after a plan change
- CO-29 — timely filing limit expired: a claim sat unworked past the payer's deadline
- CO-97 — bundled service: a modifier was missing or wrong on a separately billable service
- CO-197 — no authorization: an authorization was never obtained or ran out mid-course
- CO-B7 — provider not certified: the rendering provider isn't enrolled with that payer for that date of service
- CO-96 and CO-109 — non-covered service or wrong payer: the claim went to the wrong plan
Appeals filed inside the deadline
Every payer sets its own window for corrected claims and appeals, and a denial that is not worked inside it becomes a write-off whatever its merits. We log each payer's limits and work denials daily, so appeals go out while there is still time — and because we make the payer calls ourselves, your staff stay with patients.
Specialty denial patterns we see
Each specialty has its own pattern: CO-197 for lapsed authorizations in behavioral health, CO-16 for documentation detail in psychiatry, CO-97 for bundled add-ons with nurse practitioners, CO-27 for terminated coverage in family medicine and pediatrics, CO-96 for medical-dental crossover claims. Knowing the pattern is what lets us stop it rather than just appeal it.