CO-197 reads: precertification, authorization or notification absent.
It is the most written-off denial in behavioral health and substance use treatment, and it is also the one with the largest genuinely recoverable balance sitting inside it. Those two facts are related — the pile is big because nobody works it.
The reason is understandable. CO-197 feels final. The auth wasn’t there, the service happened anyway, the money is gone. That instinct is wrong more often than it is right.
Four things CO-197 actually means
1. The auth existed but wasn’t on the claim. Number transposed, wrong field, expired by the time of submission. The service was authorised. This is a corrected claim, not an appeal, and it pays.
2. The auth covered a different level of care. Common in SUD. The patient was authorised for residential, stepped down to IOP mid-episode, and the IOP days billed against a residential auth. Retro-authorisation for the step-down is often available.
3. The auth ran out of units mid-episode. Concurrent review was late or nobody filed the extension. Most payers permit retro-authorisation within a defined window — often 30 to 90 days — with clinical documentation showing continued medical necessity.
4. No authorisation was ever obtained. This one is usually a true write-off. It is also the smallest of the four categories at most practices, which is exactly why treating all CO-197 as unrecoverable is so expensive.
The clock nobody is watching
Retro-authorisation windows are short and they run from the date of service, not the date of denial. A remittance that arrives three weeks after discharge has already consumed a third of the window.
That means CO-197 has a property most denials don’t: it decays. A CO-197 worked in week two is often recoverable. The identical denial worked in month four usually is not — not because the clinical case changed, but because the door closed while it sat in a queue.
Why the loss compounds beyond the claim
After enough CO-197 write-offs, admissions staff start refusing patients whose authorisation is pending. In behavioral health and SUD that is not a neutral business decision — it turns a billing failure into an access failure, and the patients turned away are usually the ones in the most acute need.
Nobody records that number anywhere. It shows up as census, not as denials.
Run this on your own remits
1. Pull 12 months of CO-197 and sort into the four buckets above. Most practices have never done this and assume bucket 4 is the whole pile. Do it once and you will know your real recoverable percentage instead of guessing at it.
2. Measure days from date of service to first touch on each CO-197. Compare that against each payer’s retro-auth window. If your average first-touch is longer than the window, every denial in that queue is dead on arrival and no amount of appeal skill will change it.
3. Pull CO-197s where an authorisation number exists in your system but not on the submitted claim. That is bucket 1, pure clerical loss. These correct and pay in full, and finding them takes one join between your auth log and your claim file.
Find something and want the fix? Reply and say so. Find nothing? Genuinely worth knowing for certain.
When CO-197 isn’t the real problem
If the same payer generates most of your CO-197 volume, the issue is upstream of billing. Either their portal is not being checked at admission, or your concurrent-review cadence does not match their required interval. Fixing the appeal process will recover this quarter’s money and none of next quarter’s.