| Nurse practitioner | 1,155 |
| Physician assistant | 542 |
| Family practice | 343 |
| Internal medicine | 266 |
| Certified Registered Nurse Anesthetist (CRNA) | 261 |
| Emergency medicine | 254 |
| Physical therapist (private practice) | 220 |
| Anesthesiology | 149 |
| Licensed clinical social worker | 143 |
| Diagnostic Radiology | 141 |
| Mental Health Counselors | 132 |
| Hospitalist | 125 |
| Optometrist | 115 |
| Chiropractic | 110 |
| Obstetrics/gynecology | 110 |
| Cardiology | 98 |
| Gastroenterology | 96 |
| Psychiatry | 87 |
| Clinical psychologist | 86 |
| Centralized Flu | 83 |
| Neurology | 77 |
| General surgery | 71 |
| Anesthesiologist Assistant | 69 |
| Orthopedic surgery | 67 |
| Mass Immunization Roster Billers | 67 |
| Hematology/oncology | 62 |
| Ophthalmology | 60 |
| Pulmonary disease | 56 |
| Dermatology | 53 |
| Pathology | 51 |
| Podiatry | 50 |
| Occupational therapist (private practice) | 49 |
| Critical care (intensivists) | 47 |
| Nephrology | 42 |
| Urology | 39 |
| Otolaryngology | 37 |
| Neurosurgery | 35 |
| Physical medicine and rehabilitation | 31 |
| Infectious disease | 31 |
| Audiologist (billing independently) | 31 |
| Endocrinology | 27 |
| Pediatric medicine | 27 |
| Radiation oncology | 27 |
| Registered Dietician/Nutrition Professional | 25 |
| Interventional Cardiology | 25 |
| General practice | 24 |
| Pain Management | 24 |
| Certified nurse midwife | 23 |
| Ambulatory Surgical Center | 23 |
| Rheumatology | 21 |
| Interventional Pain Management (IPM) | 16 |
| Cardiac Electrophysiology | 16 |
| Speech / language pathology | 15 |
| Plastic and reconstructive surgery | 14 |
| Interventional radiology | 13 |
| Marriage and Family Therapist | 13 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 12 |
| Clinical Laboratory (Billing Independently) | 12 |
| Surgical oncology | 12 |
| Thoracic surgery | 11 |
| Colorectal surgery (formerly proctology) | 9 |
| Vascular surgery | 9 |
| Independent Diagnostic Testing Facility (IDTF) | 9 |
| Allergy/immunology | 9 |
| Hand surgery | 8 |
| Sports Medicine | 8 |
| Opioid Treatment Program | 6 |
| Epileptologists | 6 |
| Medical oncology | 5 |
| Advanced Heart Failure and Transplant Cardiology | 5 |
| Maxillofacial surgery | 5 |
| Gynecologist/oncologist | 5 |
| Pharmacy | 5 |
| Hospice and Palliative Care | 4 |
| Sleep Medicine | 3 |
| Psychologist (billing independently) | 3 |
| Geriatric medicine | 3 |
| Cardiac surgery | 3 |
| Peripheral vascular disease | 2 |
| Hematology | 2 |
| Neuropsychiatry | 2 |
| Osteopathic manipulative therapy | 2 |
| Oral surgery (dentists only) | 2 |
| Medical Genetics and Genomics | 2 |
| Home Infusion Therapy Services | 1 |
| Addiction medicine | 1 |
| Nuclear medicine | 1 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Preventive medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| General Psychiatry | 1 |