What is a 'modifier' in CPT coding and why is it used?

What is a 'modifier' in CPT coding and why is it used?

• A. A separate fee schedule for modifiers that replaces the CPT code.
• B. A two-digit or more code appended to a CPT code to provide additional information about the service; used to indicate different technique, timing, or places.
• C. A patient eligibility code used in enrollment.
• D. A facility code indicating the hospital department.

Answer: (B)