| Nurse practitioner | 1,055 |
| Internal medicine | 721 |
| Physician assistant | 545 |
| Family practice | 385 |
| Certified Registered Nurse Anesthetist (CRNA) | 348 |
| Physical therapist (private practice) | 338 |
| Emergency medicine | 328 |
| Anesthesiology | 247 |
| Diagnostic Radiology | 228 |
| Psychiatry | 192 |
| Obstetrics/gynecology | 174 |
| Hospitalist | 168 |
| Clinical psychologist | 166 |
| Licensed clinical social worker | 154 |
| Cardiology | 139 |
| Neurology | 138 |
| Optometrist | 118 |
| Mass Immunization Roster Billers | 116 |
| General surgery | 113 |
| Gastroenterology | 106 |
| Pulmonary disease | 99 |
| Mental Health Counselors | 97 |
| Podiatry | 96 |
| Ophthalmology | 92 |
| Pathology | 90 |
| Nephrology | 86 |
| Orthopedic surgery | 82 |
| Chiropractic | 80 |
| Physical medicine and rehabilitation | 76 |
| Infectious disease | 74 |
| Occupational therapist (private practice) | 72 |
| Hematology/oncology | 62 |
| Dermatology | 60 |
| Endocrinology | 51 |
| Urology | 45 |
| Critical care (intensivists) | 42 |
| Otolaryngology | 37 |
| Rheumatology | 35 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 34 |
| Radiation oncology | 34 |
| Pediatric medicine | 34 |
| Audiologist (billing independently) | 32 |
| Certified nurse midwife | 32 |
| Registered Dietician/Nutrition Professional | 30 |
| Medical oncology | 28 |
| Advanced Heart Failure and Transplant Cardiology | 26 |
| Vascular surgery | 25 |
| Interventional radiology | 24 |
| Centralized Flu | 24 |
| Plastic and reconstructive surgery | 23 |
| Interventional Cardiology | 23 |
| Neurosurgery | 23 |
| Allergy/immunology | 21 |
| Cardiac Electrophysiology | 21 |
| General practice | 18 |
| Ambulatory Surgical Center | 17 |
| Speech / language pathology | 16 |
| Geriatric medicine | 15 |
| Pharmacy | 15 |
| Thoracic surgery | 14 |
| Sports Medicine | 13 |
| Oral surgery (dentists only) | 12 |
| Hospice and Palliative Care | 12 |
| Hematology | 12 |
| Sleep Medicine | 11 |
| Colorectal surgery (formerly proctology) | 11 |
| Gynecologist/oncologist | 9 |
| Hand surgery | 9 |
| Pain Management | 9 |
| Opioid Treatment Program | 8 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 8 |
| Independent Diagnostic Testing Facility (IDTF) | 8 |
| Marriage and Family Therapist | 7 |
| Epileptologists | 6 |
| Clinical Laboratory (Billing Independently) | 6 |
| Osteopathic manipulative therapy | 5 |
| Nuclear medicine | 5 |
| Surgical oncology | 4 |
| Psychologist (billing independently) | 4 |
| Certified clinical nurse specialist | 3 |
| Home Infusion Therapy Services | 3 |
| Adult Congenital Heart Disease | 3 |
| Maxillofacial surgery | 3 |
| Micrographic Dermatologic Surgery | 2 |
| Neuropsychiatry | 2 |
| Addiction medicine | 2 |
| Dentist | 2 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Preventive medicine | 1 |
| General Psychiatry | 1 |
| Unknown Provider | 1 |
| Interventional Pain Management (IPM) | 1 |
| Cardiac surgery | 1 |
| Medical Toxicology | 1 |