What is the difference between CPT modifier 25 and 59?

• A. Modifier 25 indicates separately identifiable E/M service on the same day as a procedure; Modifier 59 indicates a distinct procedure not ordinarily billed together
• B. Modifier 25 is a separate indicator for multiple procedures
• C. Modifier 25 is a payment denial; Modifier 59 is for unbundling
• D. They are interchangeable

Answer: (A)

Modifier 25 signals a separately identifiable evaluation and management (E/M) service on the same day as a procedure. It means the patient received an E/M service that is distinct from the procedure, and there must be documentation showing why the E/M is separate and necessary, so it can be paid separately from the procedure.

Modifier 59 signals a distinct procedural service—the second procedure is not ordinarily billed together with the first and is considered separate because it represents a different clinical service or domain. It is used to indicate that two procedures performed in the same encounter should be unbundled for payment, but only when there is a true distinction and the procedures would normally be bundled.

The other options misstate these roles or imply interchangeability, which isn’t accurate.