The -25 modifier indicates a significant, separately identifiable evaluation and management (E/M) service by the same doctor on the same day as another procedure/service. The E/M service must be beyond the other service the doctor provided or beyond the usual preoperative or postoperative care associated with the procedure.
We do not require different diagnoses for reporting the E/M service on the same date, but both services should be distinct. Report the E/M service by appending a modifier -25 to the E/M code.
If you are seeing a patient for one condition, but the patient presents a totally different problem that you must also address during the visit. Or, the condition for which you were providing the original service may prompt the E/M service. Here are some examples: