Level I - CPT Modifiers for ASC Use

Modifiers Approved for Ambulatory Surgery Center (ASC) Hospital Outpatient Use

25	Significant, Separately Identifiable Evaluation and Management Service by the Same Physician on the Same Day of the Procedure or Other Service
27	Multiple Outpatent Hospital E/M Encounters on the Same Day
50	Bilateral Procedure
52	Reduced Services
58	Staged or Related Procedure or Service by the Same Physician During the Postoperative Period
59	Distinct Procedural Service
73	Discontinued Out-Patient Hospital/Ambulatory Surgery Center (ASC) Procedure Prior to the Administration of Anesthesia
74	Discontinued Out-Patient Hospital/Ambulatory Surgical Center (ASC) procedure After Administration of Anesthesia
76	Repeat Procedure or Service by Same Physician
77	Repeat Procedure by Another Physician
78	Unplanned return to the Operating/Procedure Room by the Same Physician Following Initial Procedure for a Related Procedure During the Postoperative Period
79	Unrelated Procedure or Service by the Same Physician During the Postoperative Period
91	Repeat Clinical Diagnostic Laboratory Test