| Nurse practitioner | 511 |
| Certified Registered Nurse Anesthetist (CRNA) | 200 |
| Family practice | 180 |
| Physical therapist (private practice) | 172 |
| Internal medicine | 160 |
| Physician assistant | 131 |
| Licensed clinical social worker | 106 |
| Anesthesiology | 97 |
| Diagnostic Radiology | 81 |
| Mental Health Counselors | 69 |
| Emergency medicine | 66 |
| Obstetrics/gynecology | 63 |
| Mass Immunization Roster Billers | 59 |
| Psychiatry | 59 |
| Optometrist | 54 |
| Orthopedic surgery | 50 |
| Chiropractic | 48 |
| General surgery | 45 |
| Pathology | 44 |
| Cardiology | 41 |
| Pediatric medicine | 40 |
| Occupational therapist (private practice) | 37 |
| Gastroenterology | 33 |
| Ophthalmology | 33 |
| Clinical psychologist | 30 |
| Neurology | 30 |
| Endocrinology | 23 |
| Pulmonary disease | 23 |
| Otolaryngology | 23 |
| Dermatology | 22 |
| Nephrology | 22 |
| Hematology/oncology | 22 |
| Pharmacy | 21 |
| Ambulatory Surgical Center | 20 |
| Neurosurgery | 19 |
| Infectious disease | 16 |
| Speech / language pathology | 16 |
| Urology | 15 |
| Podiatry | 15 |
| Audiologist (billing independently) | 13 |
| Physical medicine and rehabilitation | 13 |
| Interventional Cardiology | 13 |
| Allergy/immunology | 12 |
| Interventional radiology | 12 |
| Radiation oncology | 12 |
| Geriatric medicine | 12 |
| Rheumatology | 11 |
| Registered Dietician/Nutrition Professional | 9 |
| Cardiac Electrophysiology | 9 |
| Pain Management | 8 |
| Vascular surgery | 8 |
| Thoracic surgery | 8 |
| Medical oncology | 7 |
| Centralized Flu | 7 |
| Plastic and reconstructive surgery | 7 |
| Clinical Laboratory (Billing Independently) | 7 |
| Hospice and Palliative Care | 7 |
| Colorectal surgery (formerly proctology) | 6 |
| Hand surgery | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 6 |
| Surgical oncology | 5 |
| Cardiac surgery | 4 |
| Hospitalist | 4 |
| Gynecologist/oncologist | 4 |
| Critical care (intensivists) | 4 |
| General practice | 3 |
| Hematology | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Nuclear medicine | 3 |
| Opioid Treatment Program | 2 |
| Dentist | 2 |
| Certified clinical nurse specialist | 2 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 2 |
| Certified nurse midwife | 1 |
| General Psychiatry | 1 |
| Radiation Therapy Centers | 1 |
| Sleep Medicine | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Oral surgery (dentists only) | 1 |
| Sports Medicine | 1 |
| Marriage and Family Therapist | 1 |
| Interventional Pain Management (IPM) | 1 |
| Home Infusion Therapy Services | 1 |
| Preventive medicine | 1 |