What is a CPT Code?
Current Procedural Terminology (CPT) codes are used to describe services rendered to patients. If you are going to bill an insurance company for your services, you must describe those services by using a CPT code (or, in the case of some Medicaid patients, a special Medicaid code). CPT codes that describe the provision of mental health services start with the digit "9"; Medicaid codes usually (but not always) start with "H". All are five characters long.