Diagnosis code ___ not effective for this DOS

REJECTION: Diagnosis code (number/letter will be specified) not effective for this DOS (FE137)

WHAT HAPPENED: Diagnosis code is not valid for the date of service.

RESOLUTION: Verify the date of service and confirm the diagnosis code was valid during that time period. If not, update the claim with a diagnosis code that was effective on the service date, then resubmit.