| Nurse practitioner | 1,828 |
| Physician assistant | 857 |
| Family practice | 543 |
| Internal medicine | 419 |
| Certified Registered Nurse Anesthetist (CRNA) | 382 |
| Emergency medicine | 373 |
| Physical therapist (private practice) | 347 |
| Anesthesiology | 250 |
| Diagnostic Radiology | 220 |
| Licensed clinical social worker | 212 |
| Mental Health Counselors | 191 |
| Hospitalist | 187 |
| Optometrist | 185 |
| Obstetrics/gynecology | 175 |
| Chiropractic | 171 |
| Cardiology | 153 |
| Gastroenterology | 141 |
| Clinical psychologist | 127 |
| Psychiatry | 123 |
| Centralized Flu | 118 |
| Neurology | 115 |
| General surgery | 108 |
| Orthopedic surgery | 101 |
| Anesthesiologist Assistant | 100 |
| Hematology/oncology | 98 |
| Mass Immunization Roster Billers | 95 |
| Ophthalmology | 94 |
| Pulmonary disease | 88 |
| Pathology | 81 |
| Podiatry | 81 |
| Occupational therapist (private practice) | 79 |
| Dermatology | 76 |
| Nephrology | 70 |
| Critical care (intensivists) | 66 |
| Urology | 56 |
| Otolaryngology | 50 |
| Endocrinology | 46 |
| Physical medicine and rehabilitation | 46 |
| Radiation oncology | 46 |
| Neurosurgery | 44 |
| Audiologist (billing independently) | 43 |
| Pain Management | 42 |
| Infectious disease | 42 |
| Ambulatory Surgical Center | 39 |
| General practice | 38 |
| Pediatric medicine | 36 |
| Certified nurse midwife | 33 |
| Interventional Cardiology | 33 |
| Registered Dietician/Nutrition Professional | 31 |
| Rheumatology | 30 |
| Plastic and reconstructive surgery | 27 |
| Speech / language pathology | 26 |
| Interventional radiology | 24 |
| Interventional Pain Management (IPM) | 24 |
| Cardiac Electrophysiology | 23 |
| Clinical Laboratory (Billing Independently) | 21 |
| Marriage and Family Therapist | 19 |
| Thoracic surgery | 18 |
| Vascular surgery | 15 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 14 |
| Medical oncology | 14 |
| Surgical oncology | 14 |
| Sports Medicine | 12 |
| Colorectal surgery (formerly proctology) | 11 |
| Allergy/immunology | 11 |
| Hand surgery | 11 |
| Independent Diagnostic Testing Facility (IDTF) | 10 |
| Sleep Medicine | 10 |
| Pharmacy | 9 |
| Hospice and Palliative Care | 9 |
| Epileptologists | 8 |
| Opioid Treatment Program | 7 |
| Advanced Heart Failure and Transplant Cardiology | 7 |
| Maxillofacial surgery | 7 |
| Gynecologist/oncologist | 7 |
| Cardiac surgery | 7 |
| Geriatric medicine | 6 |
| Osteopathic manipulative therapy | 4 |
| Oral surgery (dentists only) | 4 |
| Peripheral vascular disease | 3 |
| Addiction medicine | 3 |
| Psychologist (billing independently) | 3 |
| General Psychiatry | 3 |
| Hematology | 2 |
| Neuropsychiatry | 2 |
| Medical Genetics and Genomics | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Home Infusion Therapy Services | 1 |
| Nuclear medicine | 1 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Preventive medicine | 1 |
| Unknown Provider | 1 |