What does CPT modifier 59 indicate?

• A. Indicates a repeated procedure
• B. Indicates anesthesia modifier
• C. A distinct, separate procedure or service that is not normally billed together with the primary procedure
• D. A global period modifier

Answer: (C)

Modifier 59 signals that a second procedure or service performed during the same encounter is distinct or separate from the primary procedure and would not normally be bundled together. This allows the second procedure to be paid separately when it’s truly a separate event (for example, different sites or a different condition being treated) rather than part of a bundled set. It is not an anesthesia modifier, not a global-period indicator, and not simply a marker of a repeated procedure. In practice, you’d attach this modifier to the second procedure’s code to show it stands alone from the primary procedure, recognizing that payer rules may vary and some use newer modifiers to convey the same idea.