CO-112 denial code
Service not furnished directly to the patient or not documented
How to fix it
Produce documentation showing the service was delivered directly. Appeal with the record.
How to prevent it
Ensure services delivered by staff under supervision meet the payer's incident-to or supervision documentation rules.
In practice
A practice bills a service performed by a medical assistant under physician supervision. The payer reviews and returns CO-112, finding no record that the service was furnished directly to the patient by an eligible provider.
Incident-to and supervision rules permit staff to deliver certain services under a physician's billing, but they attach conditions: an established plan of care, the required level of supervision present, and documentation showing both.
The appeal has to show the conditions were met on that date, which usually means producing the supervising physician's presence in the record. Where the note names only the assistant and no supervision is documented, the appeal has nothing to stand on.
What sits behind it
The supervision levels are distinct and frequently confused. General supervision means the service is furnished under the physician's overall direction without requiring presence. Direct supervision requires the physician to be immediately available in the office suite. Personal supervision requires them in the room.
Which level applies is determined per service rather than per practice, and billing a service requiring direct supervision on a day the physician was at another location produces exactly this denial. The schedule becomes evidence in a way most practices do not anticipate.
Telehealth and remote monitoring have complicated this further, since presence has a different meaning when care is delivered at a distance. Practices billing these services should confirm what the payer currently requires rather than relying on rules learned before the delivery model changed.
Related codes
Terms used here — Medical Necessity · E/M Coding · Denial
How we handle it — Medical Coding · Denial Management · Practice Analytics
Primary sources
The rules behind CO-112, at the bodies that publish them.
- Evaluation and Management services guide (opens in a new tab)
Centers for Medicare & Medicaid Services — How E/M level is determined under the current medical decision making and time rules. The reference for any dispute about whether documentation supports a level.
- Medicare Claims Processing Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — The operative manual for how Medicare claims must be coded, submitted, adjusted and appealed. When a payer policy and a vendor's advice disagree, this settles it.
- Medicare claims appeals process (opens in a new tab)
Centers for Medicare & Medicaid Services — The five levels of appeal, what each requires and the deadline for each. Missing a level's deadline ends the appeal regardless of the claim's merits.
Looking for a different code? Search all 190 CARC and RARC codes
Questions about CO-112
An established plan of care from the billing physician, evidence that the supervision level required for that service was met on the date, and a note identifying who performed the work. A note naming only the staff member, with no supervising physician recorded, will not survive review.
General supervision means the service is furnished under the physician's overall direction without requiring their presence. Direct supervision requires them immediately available in the office suite. Personal supervision requires them in the room. Which applies is set per service, not per practice.
It can become decisive. Where a service requires direct supervision and the physician was at another location that day, the schedule contradicts the billing, and reviewers do look at it. Aligning what is billed with where supervising physicians actually were prevents the problem.
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