What does 99213 with a modifier 25 mean?

The code 99213 is a Current Procedural Terminology (CPT) code used to bill for an established patient office visit that involves a moderate level of complexity. When paired with modifier 25, it indicates that the visit included a significant, separately identifiable evaluation and management service beyond the usual service associated with a procedure performed on the same day. This modifier helps distinguish the office visit from other procedures billed on the same day, ensuring appropriate reimbursement for both services.