CO-96: Non-covered charges

What causes CO-96?

• The service is genuinely excluded from the plan — cosmetic, experimental, or outside the benefit
• The service is covered but was billed under a code the plan excludes
• A carved-out benefit administered by a different organization entirely
• Statutory exclusion under Medicare, which no appeal will overturn

How do you fix a CO-96 denial?

1. Read the RARC. CO-96 alone does not distinguish an exclusion from a coding problem, and those have opposite remedies
2. Confirm whether an Advance Beneficiary Notice was obtained. Without one you generally cannot bill a Medicare patient for a statutorily excluded service
3. If it is a carve-out, find the administering organization and rebill there — this is often behavioral health, dental or vision
4. Read the GROUP code before doing anything with the balance. PR-96 is patient responsibility and billable; CO-96 is a contractual write-off and is not. The same CARC arrives under either group depending on the payer and the reason

Can CO-96 be prevented?

Eligibility verification that records the plan type, not merely that coverage is active, catches most of these before the visit.

A denial like this one is the recurring cost that medical billing outsourcing is built to take off your desk — a dedicated seat working the queue instead of it waiting for whoever has a free hour.

Codes worked the same way

CO-96 is appealed with clinical documentation. So are these, which is why a queue sorted by recovery route moves faster than one sorted by code number — the same person, in the same system, with the same evidence to hand, clears all of them in one pass.

• CO-50 — Not deemed medically necessary
• CO-151 — Too many services billed
• CO-170 — Provider type not paid
• CO-234 — Not paid separately
• CO-236 — Modifier combination not allowed
• CO-231 — Mutually exclusive procedures

Specialties that name this among their costliest

These are specialties whose own worst denials include one of this kind. The line under each is the denial they name, quoted from their page so you can see what the link is based on.

• Pain Management
  RFA denied because the chart does not carry percent relief and duration from both diagnostic blocks
• Orthopedics
  Implant and hardware charges denied for missing invoice documentation
• Behavioral Health
  Time-based psychotherapy codes not supported by documented duration
• Cardiology
  Stress tests denied for medical necessity documentation
• Podiatry
  At-risk foot care documentation not naming the treating physician for the systemic condition
• Physical Therapy
  Timed code units not supported by documented treatment minutes

What leaving it costs

Working a denied claim costs $57.23 per denied claim in administrative time (source) — before any of it is recovered, and whether or not it ever is.

Payers ultimately pay roughly 90% of claims even while using an initial denial to slow payment (source), so the reason one sits is rarely that nobody knows how to work it. Put your own denial count in.

Questions

Code descriptions are the standard X12 claim adjustment reason and remittance advice remark code text. Payer policies differ, and the payer’s own coverage policy governs any individual claim. This page is working guidance, not legal or clinical advice.