Modifier 33 is used to identify certain screening and preventive services. This quick reference sheet addresses:
- When to use modifier 33
- Why to use it
- Screening colorectal cancer test
- Planned screening colorectal test that converts to a diagnostic or therapeutic service
- Medicare and modifier PT
Preventive Services: 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 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.
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