Denial code CO-197: Precertification / authorization absent
The service required prior authorization and none was obtained before it was rendered.
Precertification/authorization/notification/pre-treatment absent.
What CO-197 actually means
CO-197 is among the most costly denials a practice absorbs, because the service has already been delivered and the payer’s position is that it should never have been delivered without approval. Most participating agreements bar billing the patient when the provider failed to obtain a required authorization, so an unrecovered CO-197 is a full write-off of the entire service. Retro-authorization is possible with many payers but the window is short — often measured in days — which makes speed the deciding factor in whether this denial is recoverable at all.
Why this denial happens
- The service required authorization and none was requested.
- The authorization was requested but not yet approved on the date of service.
- The service was added or changed after the authorization was obtained.
- Urgent or emergent care was rendered without the required post-service notification.
- The authorization requirement changed and the payer-specific list was not updated.
How to resolve a CO-197 denial
- Request a retro-authorization immediately — the window is short and closes fast.
- Appeal with clinical documentation where the care was urgent or emergent and authorization could not reasonably be obtained first.
- Check whether an authorization exists that simply was not transmitted on the claim — that is a CO-15 situation and is much easier to fix.
- Review the contract before billing the patient; most agreements prohibit it for provider-caused authorization failures.
How to prevent it
- Maintain a per-payer list of services requiring authorization and check it at scheduling, not at billing.
- Block scheduling of authorization-required services until the authorization is on file.
- Re-verify authorization requirements whenever a payer updates policy — lists change more often than most practices check.
Frequently asked
What does denial code CO-197 mean?
The service required prior authorization and none was obtained before it was rendered. The X12 description reads: "Precertification/authorization/notification/pre-treatment absent."
How do I fix a CO-197 denial?
Request a retro-authorization immediately — the window is short and closes fast. Appeal with clinical documentation where the care was urgent or emergent and authorization could not reasonably be obtained first. Check whether an authorization exists that simply was not transmitted on the claim — that is a CO-15 situation and is much easier to fix. Review the contract before billing the patient; most agreements prohibit it for provider-caused authorization failures.
Can CO-197 be billed to the patient?
Generally no. The recommended path for this code is "appeal or correct and resubmit" — check your payer agreement before transferring any balance to the patient.
Related denial codes
Related billing terms
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General revenue-cycle guidance, not legal, coding, or payer-specific advice. Claim adjustment reason codes are maintained by X12 and are revised periodically; payer policy and your provider agreement govern in any specific case. Always read the remark codes transmitted with the denial — they frequently carry the detail this code does not.