separately as the Current Procedural Terminology in 1966.

The CPT code revisions in 2013 were part of a periodic five-year review of codes. Some psychotherapy codes changed numbers, for example 90806 changed to 90834 for individual psychotherapy of a similar duration. Add-on codes were created for the complexity of communication about procedures. Family therapy and psychological testing codes were among those that were unchanged.

Types of code

There are three types of CPT code: Category I, Category II, and Category

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