| Nurse practitioner | 1,622 |
| Physician assistant | 787 |
| Internal medicine | 657 |
| Family practice | 601 |
| Certified Registered Nurse Anesthetist (CRNA) | 586 |
| Physical therapist (private practice) | 527 |
| Emergency medicine | 366 |
| Anesthesiology | 300 |
| Optometrist | 271 |
| Obstetrics/gynecology | 213 |
| Chiropractic | 207 |
| Mass Immunization Roster Billers | 185 |
| Orthopedic surgery | 168 |
| Licensed clinical social worker | 165 |
| General surgery | 147 |
| Diagnostic Radiology | 146 |
| Mental Health Counselors | 145 |
| Gastroenterology | 112 |
| Psychiatry | 99 |
| Podiatry | 97 |
| Ophthalmology | 94 |
| Clinical psychologist | 92 |
| Neurology | 91 |
| Nephrology | 88 |
| Cardiology | 86 |
| Dermatology | 81 |
| Pathology | 74 |
| Occupational therapist (private practice) | 70 |
| Urology | 69 |
| Centralized Flu | 62 |
| Physical medicine and rehabilitation | 61 |
| Interventional Cardiology | 57 |
| Audiologist (billing independently) | 55 |
| Pulmonary disease | 55 |
| Ambulatory Surgical Center | 55 |
| Hematology/oncology | 51 |
| Otolaryngology | 47 |
| Pediatric medicine | 44 |
| Registered Dietician/Nutrition Professional | 42 |
| Speech / language pathology | 42 |
| Infectious disease | 40 |
| Neurosurgery | 39 |
| Independent Diagnostic Testing Facility (IDTF) | 38 |
| Endocrinology | 33 |
| Plastic and reconstructive surgery | 32 |
| Pain Management | 30 |
| Clinical Laboratory (Billing Independently) | 30 |
| Rheumatology | 28 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 28 |
| Pharmacy | 26 |
| Vascular surgery | 26 |
| Hospitalist | 26 |
| Medical oncology | 24 |
| Critical care (intensivists) | 23 |
| Radiation oncology | 22 |
| Allergy/immunology | 19 |
| Cardiac Electrophysiology | 19 |
| Sports Medicine | 18 |
| Interventional Pain Management (IPM) | 17 |
| Interventional radiology | 17 |
| Surgical oncology | 16 |
| Colorectal surgery (formerly proctology) | 16 |
| Hand surgery | 13 |
| Marriage and Family Therapist | 13 |
| Thoracic surgery | 10 |
| Hospice and Palliative Care | 10 |
| Gynecologist/oncologist | 8 |
| Oral surgery (dentists only) | 8 |
| Geriatric medicine | 8 |
| Certified nurse midwife | 7 |
| Opioid Treatment Program | 7 |
| Cardiac surgery | 7 |
| Preventive medicine | 7 |
| Certified clinical nurse specialist | 7 |
| General practice | 5 |
| Portable X-Ray Supplier (Billing Independently) | 4 |
| Osteopathic manipulative therapy | 4 |
| Dentist | 4 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Maxillofacial surgery | 3 |
| Undersea and Hyperbaric Medicine | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Sleep Medicine | 2 |
| Nuclear medicine | 1 |
| Hematology | 1 |
| Peripheral vascular disease | 1 |
| Orofacial Pain | 1 |
| General Psychiatry | 1 |
| Home Infusion Therapy Services | 1 |