CPT modifier -59 is used to indicate what kind of service?

• A. A distinct procedural service when bundled codes would be included.
• B. A repeat laboratory test.
• C. Telemedicine service.
• D. An emergency service.

Answer: (A)

Modifier 59 signifies a distinct procedural service that would normally be bundled with another procedure but is separate and independent in the same encounter. This is used to unbundle two procedures that are typically grouped together so payer guidelines understand they were performed as separate events, not as part of one single package.

That’s why this choice is best: it directly matches the purpose of 59—to indicate a separate, distinct procedure when codes would ordinarily be bundled. It isn’t used for repeat lab tests, telemedicine, or emergency services, which are indicated by different modifiers or coding rules. For example, telemedicine is typically denoted by telemedicine-specific modifiers and technology-related rules, not by 59.