CPT (Current Procedural Terminology) is maintained by the AMA. Category I codes are the main five-digit procedure/service codes, grouped into six sections — with Surgery, the largest, further divided by body system.
| Section | Range |
|---|---|
| Evaluation & Management (E/M) | 99202–99499 |
| Anesthesia | 00100–01999 |
| Surgery — organized by body system: | 10021–69990 |
| Integumentary | 10021–19499 |
| Musculoskeletal | 20100–29999 |
| Respiratory | 30000–32999 |
| Cardiovascular | 33016–37799 |
| Hemic & Lymphatic | 38100–38999 |
| Mediastinum & Diaphragm | 39000–39599 |
| Digestive | 40490–49999 |
| Urinary | 50010–53899 |
| Male genital | 54000–55899 |
| Female genital & Maternity | 56405–59899 |
| Endocrine | 60000–60699 |
| Nervous | 61000–64999 |
| Eye & Ocular adnexa | 65091–68899 |
| Auditory & Operating microscope | 69000–69990 |
| Radiology — imaging, ultrasound, nuclear medicine, radiation oncology | 70010–79999 |
| Pathology & Laboratory | 80047–89398 |
| Medicine — immunizations, dialysis, cardiovascular, PT, etc. | 90281–99607 |
| Category II — optional performance-measurement codes, end in "F" | 0001F–9007F |
| Category III — temporary codes for emerging technology, end in "T" | 0042T & up |
Note: ranges are approximate and update every year — always verify against the current-year CPT® Professional manual. CPT® is a registered trademark of the American Medical Association.
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