| Nurse practitioner | 530 |
| Physician assistant | 323 |
| Physical therapist (private practice) | 223 |
| Family practice | 172 |
| Certified Registered Nurse Anesthetist (CRNA) | 154 |
| Mental Health Counselors | 142 |
| Internal medicine | 140 |
| Chiropractic | 122 |
| Anesthesiology | 97 |
| Licensed clinical social worker | 82 |
| Emergency medicine | 79 |
| Obstetrics/gynecology | 75 |
| Optometrist | 71 |
| Diagnostic Radiology | 70 |
| Hospitalist | 60 |
| Psychiatry | 54 |
| Mass Immunization Roster Billers | 53 |
| Orthopedic surgery | 52 |
| Occupational therapist (private practice) | 48 |
| Neurology | 44 |
| General surgery | 43 |
| Pathology | 40 |
| Clinical psychologist | 40 |
| Ophthalmology | 38 |
| Gastroenterology | 32 |
| Pulmonary disease | 31 |
| Audiologist (billing independently) | 30 |
| Cardiology | 29 |
| Infectious disease | 27 |
| Endocrinology | 25 |
| Speech / language pathology | 25 |
| Centralized Flu | 24 |
| Otolaryngology | 23 |
| Dermatology | 22 |
| Nephrology | 20 |
| Urology | 20 |
| Neurosurgery | 17 |
| Podiatry | 16 |
| Ambulatory Surgical Center | 15 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 15 |
| Medical oncology | 14 |
| Allergy/immunology | 13 |
| Registered Dietician/Nutrition Professional | 13 |
| Physical medicine and rehabilitation | 13 |
| Pediatric medicine | 12 |
| Rheumatology | 12 |
| Hematology | 11 |
| Vascular surgery | 11 |
| Thoracic surgery | 11 |
| Pain Management | 11 |
| Interventional Cardiology | 11 |
| Plastic and reconstructive surgery | 11 |
| Radiation oncology | 10 |
| Cardiac Electrophysiology | 10 |
| Hematology/oncology | 9 |
| Hand surgery | 9 |
| Advanced Heart Failure and Transplant Cardiology | 7 |
| Surgical oncology | 6 |
| Sports Medicine | 6 |
| Hospice and Palliative Care | 6 |
| Colorectal surgery (formerly proctology) | 6 |
| Gynecologist/oncologist | 5 |
| Independent Diagnostic Testing Facility (IDTF) | 5 |
| Geriatric medicine | 5 |
| Pharmacy | 4 |
| Certified nurse midwife | 4 |
| Epileptologists | 4 |
| Critical care (intensivists) | 4 |
| Maxillofacial surgery | 3 |
| Interventional radiology | 3 |
| Interventional Pain Management (IPM) | 3 |
| General practice | 3 |
| Home Infusion Therapy Services | 2 |
| Dentist | 2 |
| Opioid Treatment Program | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Sleep Medicine | 2 |
| Medical Genetics and Genomics | 1 |
| Marriage and Family Therapist | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Nuclear medicine | 1 |
| General Psychiatry | 1 |