The new outpatient CPT modifier 33 is the “most noteworthy” change in CMS’ Outpatient Code Editor Version 12.1, effective April 4, according to an AAPC report. Modifier 33 Preventive services is ...

Note: The description for modifier -33 is as follows: 33 Preventive Service: When the primary purpose of the service is the delivery of an evidence-based service in accordance with a US Preventive ...