Denial Code CO-146: Description, Meaning and How to Fix It
The diagnosis code was not valid for that date of service.
Official description
Diagnosis was invalid for the date(s) of service reported.
Common cause
An outdated or deleted ICD-10 code, or a code not effective on the service date.
How to fix it
Use a valid ICD-10 code effective for the date of service and resubmit.
Related denial codes
- CO-11: The diagnosis code does not match or support the procedure billed.
- CO-4: A modifier is missing or wrong for the procedure billed.
- CO-6: The procedure billed does not fit the patient's age per payer edits.
- M76: The diagnosis is missing, incomplete, or invalid on the claim.
- CO-45: The amount billed is higher than the payer's contracted (allowed) rate. The difference is a contractual write-off, not a patient balance.
- CO-16: The claim is missing required information or has an error. It is almost always paired with a RARC that names the specific missing field.