Evaluation and Management (E/M)

• Code Range: 99202 – 99499
• Includes office visits, hospital visits, consultations, preventive medicine, and case management.

Anesthesiology

• Code Range: 00100 – 01999, plus 99100 – 99140
• Includes anesthesia services for surgical, diagnostic, and obstetric procedures.

Surgery

• Code Range: 10021 – 69990
• Largest section of CPT, divided by body system (integumentary, musculoskeletal, cardiovascular, etc.).

Radiology

• Code Range: 70010 – 79999
• Includes diagnostic imaging (X-rays, CT, MRI, ultrasound), radiation oncology, and nuclear medicine.

Pathology and Laboratory

• Code Range: 80047 – 89398
• Includes lab tests, pathology procedures, panels, cytology, and other diagnostic tests.

Medicine

• Code Range: 90281 – 99607
• Includes immunizations, dialysis, psychiatry, ophthalmology, cardiovascular, neurology, pulmonary, and other specialized services.

• Category II Codes (Performance Measurement): Alphanumeric, ending with F (e.g., 0001F).
• Category III Codes (Emerging Technology): Alphanumeric, ending with T (e.g., 0075T).
• CPT Modifiers: Two-digit codes appended to CPT to give extra info (e.g., modifier -25, -59).