| Nurse practitioner | 328 |
| Physician assistant | 230 |
| Licensed clinical social worker | 188 |
| Internal medicine | 154 |
| Physical therapist (private practice) | 149 |
| Anesthesiology | 90 |
| Family practice | 86 |
| Emergency medicine | 70 |
| Psychiatry | 66 |
| Chiropractic | 56 |
| Obstetrics/gynecology | 48 |
| Cardiology | 45 |
| Mass Immunization Roster Billers | 45 |
| Hospitalist | 45 |
| General surgery | 42 |
| Clinical psychologist | 41 |
| Diagnostic Radiology | 41 |
| Optometrist | 38 |
| Orthopedic surgery | 35 |
| Pediatric medicine | 33 |
| Certified Registered Nurse Anesthetist (CRNA) | 32 |
| Podiatry | 31 |
| Mental Health Counselors | 29 |
| Gastroenterology | 27 |
| Neurology | 27 |
| Occupational therapist (private practice) | 24 |
| Ophthalmology | 24 |
| Physical medicine and rehabilitation | 22 |
| Pulmonary disease | 19 |
| Urology | 19 |
| Dermatology | 18 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 16 |
| Otolaryngology | 14 |
| Certified nurse midwife | 14 |
| Pathology | 14 |
| Hematology/oncology | 13 |
| Nephrology | 12 |
| Infectious disease | 12 |
| Endocrinology | 11 |
| Speech / language pathology | 10 |
| Centralized Flu | 10 |
| Critical care (intensivists) | 10 |
| Audiologist (billing independently) | 9 |
| Vascular surgery | 8 |
| Allergy/immunology | 8 |
| Neurosurgery | 8 |
| Registered Dietician/Nutrition Professional | 8 |
| Plastic and reconstructive surgery | 8 |
| Rheumatology | 8 |
| Ambulatory Surgical Center | 7 |
| Hand surgery | 6 |
| Pharmacy | 6 |
| Radiation oncology | 6 |
| Gynecologist/oncologist | 5 |
| Interventional Cardiology | 5 |
| Medical oncology | 5 |
| Interventional radiology | 4 |
| Cardiac Electrophysiology | 4 |
| Sports Medicine | 4 |
| Surgical oncology | 4 |
| Pain Management | 3 |
| Hospice and Palliative Care | 3 |
| Marriage and Family Therapist | 3 |
| General practice | 3 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Thoracic surgery | 2 |
| Hematology | 2 |
| Sleep Medicine | 2 |
| Opioid Treatment Program | 2 |
| Geriatric medicine | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Intensive Cardiac Rehabilitation | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Oral surgery (dentists only) | 1 |
| Addiction medicine | 1 |
| Certified clinical nurse specialist | 1 |
| Neuropsychiatry | 1 |
| Maxillofacial surgery | 1 |
| Cardiac surgery | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Preventive medicine | 1 |