CO-197: Precertification, authorization, or notification absent
The service required precertification or authorization that was not obtained, so the payer denies it as a contractual provider responsibility.
What it means
CO-197 means a required precertification, authorization, or notification was not on file when the service was rendered. The payer's benefit rules made prior authorization a condition of payment and that condition was not met. As a CO code the balance falls on the provider.
Mechanically this is an authorization edit that checks for a valid auth matching the service, dates, units, and provider. A missing auth, an expired auth, an auth for the wrong level of care, or units exceeding what was authorized will all trigger it.
Why it happens in behavioral health
CO-197 is one of the most common and costly behavioral health denials because nearly every intensive service requires authorization. IOP, PHP, and residential admissions typically need prior auth, and continued stays require concurrent review to extend the authorized days. A gap between authorized units and delivered units is a classic trigger.
SUD programs are especially exposed when a client steps up or down a level of care and the authorization does not follow, or when a weekend admission outruns the auth obtained after the fact. Match every delivered day and unit to a valid authorization for the exact level of care, and keep concurrent reviews ahead of the delivered dates.
How to fix it
- Check whether any authorization exists and whether it covers the exact dates, units, and level of care.
- If an auth exists but was mis-keyed, correct the claim to match the authorization and resubmit.
- If no auth was obtained, pursue a retroactive authorization where the payer allows one.
- File an appeal with clinical documentation when the service met criteria but auth was missed.
How to prevent it
- Obtain prior authorization before admission for IOP, PHP, and residential care.
- Run concurrent review ahead of authorized end dates so continued stays never lapse.
- Reconcile delivered units against authorized units before billing each episode.
Related denial codes
Denials like CO-197 are rarely a one-off. They trace back upstream to eligibility, coding, documentation, or a payer rule that changed. Supabill's agents work the whole revenue cycle to stop them at the source. See our guide on why behavioral health denials keep rising, or book a demo.