Use of modifier

Can you explain the use of modifier –27.

CMS does not require modifier –27 but defines it as “multiple outpatient hospital evaluation and management encounters on the same date.” Modifier –27 should be appended only to the evaluation & management (E/M) service codes. Hospitals append modifier –27 to the second and subsequent E/M code when more than one E/M service is provided to indicate that the E/M service is a “separate and distinct E/M encounter” from the service previously provided that same day in the same or different hospital setting. When reporting modifier –27, report with condition code G0 when multiple medical visits occur on the same day in the same revenue centers.