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Current Procedural Terminology (CPT) The CPT coding system is a listing of codes and descriptors for reporting services and procedures performed by physicians. It is also a key component in almost all physician payment arrangements.
How CPT codes are formatted and why. CPT codes are made up of five characters. These characters could be numeric and alphanumeric depending on which category -- the division of the CPT code set -- the CPT code is in. Unlike ICD, each number or character in a CPT code does not correspond to a particular procedure or technology. CPT codes are designed to be flexible and allow for revision.