CPT® and HCPCS Modifier Codes

CPT® Grouped by the first character of the code:
    * Note: Modifier code groups may not be sequential.

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What are Modifiers?

Modifiers are two character codes that may be associated with CPT® and HCPCS codes that indicate additional, reduced, or specific types of services (body location, performed by assistant, etc.).  Modifier codes starting with a digit (1-9) are defined as part of the CPT (Current Procedural Terminology) code set owned by the Americal Medical Association (AMA).  Modifiers beginning with a letter (A-Z) are determined by the Centers for Medicare Services (CMS) as part of the HCPCS code set.