| Nurse practitioner | 753 |
| Physical therapist (private practice) | 240 |
| Family practice | 222 |
| Certified Registered Nurse Anesthetist (CRNA) | 178 |
| Physician assistant | 164 |
| Chiropractic | 156 |
| Internal medicine | 152 |
| Emergency medicine | 136 |
| Licensed clinical social worker | 121 |
| Mass Immunization Roster Billers | 96 |
| Hospitalist | 95 |
| Optometrist | 87 |
| Anesthesiology | 81 |
| Mental Health Counselors | 72 |
| Obstetrics/gynecology | 71 |
| Psychiatry | 65 |
| General surgery | 60 |
| Diagnostic Radiology | 53 |
| Orthopedic surgery | 48 |
| Clinical psychologist | 48 |
| Occupational therapist (private practice) | 47 |
| Cardiology | 44 |
| Anesthesiologist Assistant | 35 |
| Neurology | 30 |
| Gastroenterology | 29 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 28 |
| Pulmonary disease | 28 |
| Audiologist (billing independently) | 28 |
| Ophthalmology | 25 |
| Podiatry | 24 |
| Pathology | 24 |
| Speech / language pathology | 24 |
| Nephrology | 24 |
| Hematology/oncology | 23 |
| Centralized Flu | 23 |
| Urology | 21 |
| Dermatology | 17 |
| Physical medicine and rehabilitation | 17 |
| Otolaryngology | 16 |
| Ambulatory Surgical Center | 16 |
| Interventional Cardiology | 16 |
| Neurosurgery | 15 |
| Critical care (intensivists) | 13 |
| Infectious disease | 13 |
| Radiation oncology | 12 |
| Vascular surgery | 12 |
| Rheumatology | 12 |
| Endocrinology | 11 |
| Cardiac Electrophysiology | 11 |
| Pediatric medicine | 11 |
| Allergy/immunology | 9 |
| Registered Dietician/Nutrition Professional | 9 |
| Sports Medicine | 8 |
| Cardiac surgery | 7 |
| Interventional Pain Management (IPM) | 7 |
| Pain Management | 7 |
| General practice | 6 |
| Plastic and reconstructive surgery | 6 |
| Hospice and Palliative Care | 5 |
| Clinical Laboratory (Billing Independently) | 5 |
| Marriage and Family Therapist | 5 |
| Certified nurse midwife | 5 |
| Certified clinical nurse specialist | 5 |
| Advanced Heart Failure and Transplant Cardiology | 5 |
| Medical oncology | 5 |
| Gynecologist/oncologist | 5 |
| Thoracic surgery | 4 |
| Interventional radiology | 4 |
| Colorectal surgery (formerly proctology) | 3 |
| Pharmacy | 3 |
| Maxillofacial surgery | 3 |
| Dentist | 2 |
| Geriatric medicine | 2 |
| Oral surgery (dentists only) | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Surgical oncology | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Hematology | 1 |
| Osteopathic manipulative therapy | 1 |
| Epileptologists | 1 |
| Preventive medicine | 1 |
| Hand surgery | 1 |