| Nurse practitioner | 1,266 |
| Physician assistant | 1,205 |
| Physical therapist (private practice) | 790 |
| Family practice | 606 |
| Internal medicine | 537 |
| Licensed clinical social worker | 378 |
| Emergency medicine | 351 |
| Mental Health Counselors | 345 |
| Anesthesiology | 299 |
| Optometrist | 260 |
| Certified Registered Nurse Anesthetist (CRNA) | 232 |
| Obstetrics/gynecology | 211 |
| Diagnostic Radiology | 209 |
| Hospitalist | 197 |
| Chiropractic | 179 |
| Clinical psychologist | 178 |
| Orthopedic surgery | 147 |
| Psychiatry | 145 |
| General surgery | 131 |
| Neurology | 120 |
| Mass Immunization Roster Billers | 111 |
| Gastroenterology | 107 |
| Ophthalmology | 106 |
| Occupational therapist (private practice) | 104 |
| Dermatology | 98 |
| Anesthesiologist Assistant | 95 |
| Cardiology | 82 |
| Physical medicine and rehabilitation | 82 |
| Pulmonary disease | 81 |
| Podiatry | 75 |
| Speech / language pathology | 68 |
| Otolaryngology | 64 |
| Infectious disease | 64 |
| Pathology | 63 |
| Urology | 59 |
| Nephrology | 58 |
| Audiologist (billing independently) | 58 |
| Critical care (intensivists) | 52 |
| Endocrinology | 46 |
| Centralized Flu | 45 |
| Neurosurgery | 42 |
| Rheumatology | 42 |
| Ambulatory Surgical Center | 42 |
| Hematology/oncology | 41 |
| Marriage and Family Therapist | 40 |
| Certified nurse midwife | 40 |
| Medical oncology | 35 |
| Interventional Cardiology | 30 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 30 |
| Radiation oncology | 29 |
| Registered Dietician/Nutrition Professional | 29 |
| Interventional radiology | 28 |
| Geriatric medicine | 26 |
| Pediatric medicine | 25 |
| Allergy/immunology | 25 |
| Plastic and reconstructive surgery | 24 |
| Clinical Laboratory (Billing Independently) | 21 |
| Certified clinical nurse specialist | 20 |
| Sports Medicine | 20 |
| Independent Diagnostic Testing Facility (IDTF) | 20 |
| Hospice and Palliative Care | 19 |
| Cardiac Electrophysiology | 19 |
| Hand surgery | 17 |
| Thoracic surgery | 15 |
| Vascular surgery | 14 |
| General practice | 11 |
| Colorectal surgery (formerly proctology) | 10 |
| Sleep Medicine | 10 |
| Opioid Treatment Program | 10 |
| Pain Management | 10 |
| Surgical oncology | 10 |
| Advanced Heart Failure and Transplant Cardiology | 9 |
| Oral surgery (dentists only) | 8 |
| Gynecologist/oncologist | 8 |
| Micrographic Dermatologic Surgery | 8 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 7 |
| Osteopathic manipulative therapy | 7 |
| Medical Toxicology | 7 |
| Epileptologists | 6 |
| Pharmacy | 6 |
| Medical Genetics and Genomics | 5 |
| Hematology | 5 |
| Maxillofacial surgery | 3 |
| Nuclear medicine | 3 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Dentist | 2 |
| Addiction medicine | 2 |
| Cardiac surgery | 2 |
| Neuropsychiatry | 2 |
| Preventive medicine | 1 |
| Psychologist (billing independently) | 1 |
| Adult Congenital Heart Disease | 1 |
| General Psychiatry | 1 |
| Home Infusion Therapy Services | 1 |