Current Procedural Terminology 4th Edition (CPT 4): CPT 4 a numeric uniform coding system consisting of descriptive terms and identifying codes that are used primarily to identify medical services and procedures furnished by physicians and other healthcare professionals. CPT is currently identified by the Centers for Medicare and Medicaid Services (CMS) as Level 1 of the Healthcare Common Procedure Coding System. CPT code is maintained by the American Medical Association (AMA).