| Nurse practitioner | 1,298 |
| Physician assistant | 563 |
| Physical therapist (private practice) | 558 |
| Internal medicine | 468 |
| Family practice | 422 |
| Certified Registered Nurse Anesthetist (CRNA) | 312 |
| Licensed clinical social worker | 257 |
| Obstetrics/gynecology | 213 |
| Emergency medicine | 211 |
| Anesthesiology | 196 |
| Diagnostic Radiology | 177 |
| Chiropractic | 175 |
| Mass Immunization Roster Billers | 144 |
| Clinical psychologist | 144 |
| Cardiology | 141 |
| Hospitalist | 131 |
| Podiatry | 129 |
| Optometrist | 129 |
| Occupational therapist (private practice) | 126 |
| Mental Health Counselors | 122 |
| Psychiatry | 104 |
| Gastroenterology | 98 |
| Neurology | 96 |
| Orthopedic surgery | 94 |
| General surgery | 81 |
| Ophthalmology | 75 |
| Physical medicine and rehabilitation | 69 |
| Pulmonary disease | 63 |
| Dermatology | 61 |
| Nephrology | 54 |
| Infectious disease | 53 |
| Hematology/oncology | 50 |
| Pathology | 49 |
| Otolaryngology | 48 |
| Urology | 43 |
| Speech / language pathology | 42 |
| Endocrinology | 41 |
| Registered Dietician/Nutrition Professional | 41 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 36 |
| Certified nurse midwife | 35 |
| Rheumatology | 34 |
| Pediatric medicine | 33 |
| Audiologist (billing independently) | 32 |
| Radiation oncology | 27 |
| Critical care (intensivists) | 26 |
| Ambulatory Surgical Center | 24 |
| Neurosurgery | 23 |
| Centralized Flu | 22 |
| Sports Medicine | 20 |
| Addiction medicine | 18 |
| Vascular surgery | 18 |
| Interventional Cardiology | 18 |
| Colorectal surgery (formerly proctology) | 16 |
| Plastic and reconstructive surgery | 15 |
| Interventional radiology | 15 |
| Thoracic surgery | 14 |
| Marriage and Family Therapist | 14 |
| Allergy/immunology | 14 |
| Pharmacy | 13 |
| Oral surgery (dentists only) | 11 |
| Pain Management | 11 |
| Hospice and Palliative Care | 11 |
| Hand surgery | 10 |
| General practice | 9 |
| Interventional Pain Management (IPM) | 9 |
| Cardiac Electrophysiology | 9 |
| Nuclear medicine | 8 |
| Maxillofacial surgery | 8 |
| Opioid Treatment Program | 6 |
| Hematology | 6 |
| Osteopathic manipulative therapy | 6 |
| Independent Diagnostic Testing Facility (IDTF) | 6 |
| Medical oncology | 5 |
| Gynecologist/oncologist | 5 |
| Certified clinical nurse specialist | 5 |
| Surgical oncology | 5 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Geriatric medicine | 4 |
| Cardiac surgery | 4 |
| Preventive medicine | 3 |
| Dentist | 3 |
| Psychologist (billing independently) | 3 |
| Sleep Medicine | 2 |
| Micrographic Dermatologic Surgery | 2 |
| General Psychiatry | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Clinical Laboratory (Billing Independently) | 1 |