CO-152 denial code
Documentation does not support this length of service
How to fix it
Produce documentation of actual time, including start and stop times where the code requires them.
How to prevent it
For time-based codes, record the total explicitly. An appointment length is not documentation of service time.
In practice
A practice bills 99417 for prolonged service beyond a level five visit. On review, the note records the visit but never states how long it took, and the claim returns CO-152.
Time-based codes are paid on documented time, and an undocumented duration is treated as no duration at all. The clinical work may have been extensive; without the record saying so, there is nothing to reimburse against.
Where the note does state total time, the appeal is straightforward and usually succeeds. Where it does not, the appeal fails and the fix belongs upstream in how the encounter is documented.
What sits behind it
Different code families have different time requirements and confusing them causes avoidable losses. Some require start and stop times, some require only total time on the date, and some require a threshold to be exceeded before the code applies at all.
Under the current evaluation and management framework, total time includes the non-face-to-face work performed on the date of the encounter — reviewing records, ordering, documenting, coordinating care. Practices recording only face-to-face time systematically undercount and undercode.
The distinction that matters for appeals is between a note that omits time and one that states it imprecisely. An omitted time cannot be added afterwards without creating a late entry problem. A stated time supported by the record is defensible even if the reviewer disagreed with it.
Related codes
Terms used here — E/M Coding · CPT Code · Medical Necessity
How we handle it — Medical Coding · Denial Management · Practice Analytics
Primary sources
The rules behind CO-152, 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-152
It varies by code family. Some require explicit start and stop times, others only total time on the date of service, and some require a threshold to be crossed before the code applies. Check the requirement for the specific code rather than assuming a uniform standard.
Under the current evaluation and management rules, yes — total time on the date of the encounter includes record review, ordering, documentation and care coordination as well as face-to-face time. Practices counting only face-to-face time systematically undercode.
Not without creating a late entry, which reviewers treat with considerable suspicion and which can undermine the whole record. If the time was genuinely recorded elsewhere contemporaneously, that source can be produced. Reconstructing it from memory cannot.
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