| Nurse practitioner | 366 |
| Licensed clinical social worker | 248 |
| Physician assistant | 238 |
| Family practice | 191 |
| Physical therapist (private practice) | 151 |
| Internal medicine | 140 |
| Certified Registered Nurse Anesthetist (CRNA) | 87 |
| Mental Health Counselors | 84 |
| Chiropractic | 74 |
| Clinical psychologist | 71 |
| Optometrist | 69 |
| Emergency medicine | 67 |
| Anesthesiology | 57 |
| Psychiatry | 55 |
| Obstetrics/gynecology | 53 |
| Occupational therapist (private practice) | 46 |
| Mass Immunization Roster Billers | 41 |
| Diagnostic Radiology | 40 |
| General surgery | 33 |
| Orthopedic surgery | 28 |
| Cardiology | 27 |
| Pediatric medicine | 26 |
| Hospitalist | 24 |
| Physical medicine and rehabilitation | 23 |
| Neurology | 23 |
| Podiatry | 22 |
| Audiologist (billing independently) | 22 |
| Osteopathic manipulative therapy | 21 |
| Pathology | 19 |
| Hematology/oncology | 16 |
| Speech / language pathology | 15 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 14 |
| Gastroenterology | 13 |
| Ophthalmology | 12 |
| Otolaryngology | 11 |
| Centralized Flu | 10 |
| Neurosurgery | 9 |
| Urology | 9 |
| Pulmonary disease | 8 |
| Dermatology | 8 |
| Critical care (intensivists) | 7 |
| Plastic and reconstructive surgery | 7 |
| Nephrology | 7 |
| Certified nurse midwife | 7 |
| Radiation oncology | 6 |
| Vascular surgery | 6 |
| Maxillofacial surgery | 6 |
| Ambulatory Surgical Center | 6 |
| Endocrinology | 6 |
| Rheumatology | 5 |
| Infectious disease | 5 |
| Interventional radiology | 5 |
| Allergy/immunology | 5 |
| General practice | 4 |
| Hand surgery | 4 |
| Interventional Cardiology | 4 |
| Geriatric medicine | 4 |
| Oral surgery (dentists only) | 3 |
| Thoracic surgery | 3 |
| Certified clinical nurse specialist | 3 |
| Sports Medicine | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Surgical oncology | 3 |
| Colorectal surgery (formerly proctology) | 3 |
| Marriage and Family Therapist | 2 |
| Psychologist (billing independently) | 2 |
| Pharmacy | 2 |
| Opioid Treatment Program | 2 |
| Hospice and Palliative Care | 2 |
| Medical oncology | 1 |
| Nuclear medicine | 1 |
| General Psychiatry | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Cardiac Electrophysiology | 1 |
| Medical Genetics and Genomics | 1 |
| Gynecologist/oncologist | 1 |
| Epileptologists | 1 |
| Unknown Provider | 1 |
| Addiction medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Hematology | 1 |
| Neuropsychiatry | 1 |