Denial code · Contractual Obligation (CO)
CO-146 denial code
The health reason was not valid on the date the service was given.
What the code means
Official meaning: Diagnosis was invalid for the date(s) of service reported.
In plain words: The health reason was not valid on the date the service was given.
The usual fix
Check the health reason and the date of service, fix the reason to one that was valid on that date, and send the claim again corrected.
This is general information, not advice on a specific claim.
Learn on the job
Learn on the job with real denied claims.
Working denied claims is the medical claims desk's daily work. Read a code, find what is missing, fix the claim, or write the appeal.