The modifier 33 was created to aid compliance with the Affordable Care Act (ACA) which prohibits member cost sharing for defined preventive services for non-grandfathered policies. The appropriate use of modifier 33 will reduce claim adjustments related to preventive services and your corresponding refunds to members.


Modifier 33 is applicable to CPT codes representing preventive care services. CPT codes not appended with modifier 33 will process under the member’s medical or preventive benefits, based on the diagnosis and CPT codes submitted.


Modifier 33 should be appended to codes represented for services described in the US Preventive Services Task Force (USPSTF) A and B recommendations, the Advisory Committee on Immunization Practices (ACIP) of the Centers for Disease Control and Prevention (CDC), and certain guidelines for infants, children, adolescents, and women supported by the Health Resources and Services Administration (HRSA) Guidelines.


The CPT® 2018 Professional Edition manual shares the following information regarding the billing of modifier 33, “When the primary purpose of the service is the delivery of an evidence based service in accordance with a US Preventive Services Task Force A or B rating in effect and other preventive services identified in preventive 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.”


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October 2018 Anthem Provider Newsletter - CO