CO-197 Denial Code: Precertification / authorization absent
The payer says the service required prior authorization and they don't have one on file. Frequently wrong — auth numbers get lost, mismatched, or attached to the wrong claim line.
Why it happens
- Auth was obtained but the number wasn't on the claim (or was on the wrong line)
- Auth on file under a different provider NPI or facility in the group
- Payer's own system failed to link a valid auth
- Service genuinely lacked required auth (staff miss, or emergency where none was possible)
How to fix it, step by step
- Pull the auth record from your PM/portal — number, date, services covered
- If auth existed: resubmit with the auth number, or appeal citing it — attach the approval
- If auth was under a group/other NPI: appeal explaining the linkage
- If truly missing: request retro-authorization where the payer allows it (many do for urgent/emergent care)
Is it worth working?
High when an auth actually existed — that's a documentation fight you win. Moderate for retro-auth requests.
High when an auth actually existed — that's a documentation fight you win. Moderate for retro-auth requests.
How much is your practice writing off to denials like this?
Send 6 months of remittance files (3 clicks in your billing software) — get a free one-page scorecard of your denied dollars, what's recoverable, and your top payer patterns — within one business day of receiving your files. Recovery is contingency-only: no fee unless money posts.
Get the free denial auditMore codes: the Claimmender denial-code library.