| Physician assistant | 980 |
| Nurse practitioner | 833 |
| Licensed clinical social worker | 558 |
| Family practice | 419 |
| Physical therapist (private practice) | 414 |
| Internal medicine | 338 |
| Chiropractic | 237 |
| Emergency medicine | 228 |
| Optometrist | 172 |
| Mental Health Counselors | 171 |
| Anesthesiology | 159 |
| Clinical psychologist | 152 |
| Diagnostic Radiology | 147 |
| Obstetrics/gynecology | 131 |
| Psychiatry | 124 |
| Certified Registered Nurse Anesthetist (CRNA) | 118 |
| General surgery | 85 |
| Neurology | 83 |
| Orthopedic surgery | 82 |
| Pediatric medicine | 80 |
| Mass Immunization Roster Billers | 58 |
| Ophthalmology | 52 |
| Physical medicine and rehabilitation | 50 |
| Pulmonary disease | 49 |
| Cardiology | 48 |
| Podiatry | 47 |
| Occupational therapist (private practice) | 45 |
| Pathology | 43 |
| Gastroenterology | 42 |
| Hospitalist | 42 |
| Audiologist (billing independently) | 39 |
| Otolaryngology | 38 |
| Urology | 36 |
| Dermatology | 35 |
| Centralized Flu | 34 |
| Hematology/oncology | 33 |
| Anesthesiologist Assistant | 27 |
| Infectious disease | 20 |
| Neurosurgery | 18 |
| Plastic and reconstructive surgery | 17 |
| Interventional radiology | 17 |
| Critical care (intensivists) | 17 |
| Speech / language pathology | 17 |
| Allergy/immunology | 15 |
| Nephrology | 15 |
| Endocrinology | 15 |
| Interventional Cardiology | 14 |
| Radiation oncology | 14 |
| Rheumatology | 14 |
| Vascular surgery | 14 |
| Certified nurse midwife | 13 |
| Ambulatory Surgical Center | 13 |
| Pain Management | 13 |
| Hospice and Palliative Care | 11 |
| Sports Medicine | 11 |
| Cardiac Electrophysiology | 10 |
| Hand surgery | 9 |
| Colorectal surgery (formerly proctology) | 9 |
| Thoracic surgery | 9 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Sleep Medicine | 8 |
| General practice | 8 |
| Geriatric medicine | 7 |
| Advanced Heart Failure and Transplant Cardiology | 7 |
| Surgical oncology | 6 |
| Osteopathic manipulative therapy | 4 |
| Pharmacy | 4 |
| Hematology | 4 |
| Medical oncology | 4 |
| Cardiac surgery | 3 |
| Oral surgery (dentists only) | 3 |
| Maxillofacial surgery | 3 |
| Independent Diagnostic Testing Facility (IDTF) | 3 |
| Clinical Laboratory (Billing Independently) | 3 |
| Marriage and Family Therapist | 3 |
| Opioid Treatment Program | 3 |
| Medical Genetics and Genomics | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Addiction medicine | 2 |
| Gynecologist/oncologist | 2 |
| Interventional Pain Management (IPM) | 2 |
| Unknown Provider | 2 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |
| Dentist | 1 |
| Radiation Therapy Centers | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Preventive medicine | 1 |
| Certified clinical nurse specialist | 1 |
| Unknown physician specialty | 1 |