- Addiction psychiatrist
- Adolescent medicine specialist
- Allergist (immunologist)
- Anesthesiologist
- Cardiac electrophysiologist
- Cardiologist
- Cardiovascular surgeon
- Colon and rectal surgeon
- Critical care medicine specialist
- Dermatologist
- Developmental pediatrician
- Emergency medicine specialist
- Endocrinologist
- Family medicine physician
- Forensic pathologist
- Gastroenterologist
- Geriatric medicine specialist
- Gynecologist
- Gynecologic oncologist
- Hand surgeon
- Hematologist
- Hepatologist
- Hospitalist
- Hospice and palliative medicine specialist
- Hyperbaric physician
- Infectious disease specialist
- Internist
- Interventional cardiologist
- Medical examiner
- Medical geneticist
- Neonatologist
- Nephrologist
- Neurological surgeon
- Neurologist
- Nuclear medicine specialist
- Obstetrician
- Occupational medicine specialist
- Oncologist
- Ophthalmologist
- Oral surgeon (maxillofacial surgeon)
- Orthopedic surgeon
- Otolaryngologist (ear, nose, and throat specialist)
- Pain management specialist
- Pathologist
- Pediatrician
- Perinatologist
- Physiatrist
- Plastic surgeon
- Psychiatrist
- Pulmonologist
- Radiation oncologist
- Radiologist
- Reproductive endocrinologist
- Rheumatologist
- Sleep disorders specialist
- Spinal cord injury specialist
- Sports medicine specialist
- Surgeon
- Thoracic surgeon
- Urologist
- Vascular surgeon