This is one of our articles for our next newsletter
Modifier 33 is for preventative services used when the primary purpose of the service is the delivery of an evidence based service in accordance with the US Preventative Services Task Force A or B rating in effect and other preventive services identified in preventive services mandates (legislative or regulatory) The service may be identified by adding 33 to the procedure. For Separately reported services specifically identified as preventive, the modifier should not be used.
Modifier 33 is also used to identify those covered preventive services with no cost-sharing to the patient.