| Nurse practitioner | 1,542 |
| Internal medicine | 622 |
| Physician assistant | 373 |
| Family practice | 348 |
| Certified Registered Nurse Anesthetist (CRNA) | 313 |
| Anesthesiology | 243 |
| Emergency medicine | 240 |
| Physical therapist (private practice) | 220 |
| Diagnostic Radiology | 195 |
| General practice | 170 |
| Obstetrics/gynecology | 170 |
| Cardiology | 143 |
| Clinical psychologist | 118 |
| Psychiatry | 116 |
| Ophthalmology | 114 |
| Centralized Flu | 107 |
| Neurology | 105 |
| Podiatry | 105 |
| Mass Immunization Roster Billers | 104 |
| General surgery | 104 |
| Hospitalist | 97 |
| Dermatology | 96 |
| Optometrist | 89 |
| Orthopedic surgery | 89 |
| Licensed clinical social worker | 88 |
| Gastroenterology | 87 |
| Mental Health Counselors | 70 |
| Hematology/oncology | 67 |
| Pulmonary disease | 66 |
| Pathology | 64 |
| Urology | 59 |
| Pediatric medicine | 58 |
| Occupational therapist (private practice) | 51 |
| Chiropractic | 50 |
| Physical medicine and rehabilitation | 48 |
| Endocrinology | 46 |
| Infectious disease | 44 |
| Nephrology | 43 |
| Critical care (intensivists) | 36 |
| Otolaryngology | 36 |
| Anesthesiologist Assistant | 30 |
| Radiation oncology | 30 |
| Neurosurgery | 27 |
| Rheumatology | 27 |
| Vascular surgery | 26 |
| Plastic and reconstructive surgery | 26 |
| Thoracic surgery | 21 |
| Ambulatory Surgical Center | 21 |
| Surgical oncology | 20 |
| Independent Diagnostic Testing Facility (IDTF) | 20 |
| Interventional radiology | 20 |
| Interventional Cardiology | 18 |
| Pain Management | 17 |
| Allergy/immunology | 17 |
| Speech / language pathology | 16 |
| Cardiac Electrophysiology | 15 |
| Clinical Laboratory (Billing Independently) | 14 |
| Hand surgery | 14 |
| Audiologist (billing independently) | 14 |
| Colorectal surgery (formerly proctology) | 14 |
| Marriage and Family Therapist | 12 |
| Hospice and Palliative Care | 11 |
| Interventional Pain Management (IPM) | 11 |
| Sports Medicine | 11 |
| Medical oncology | 10 |
| Registered Dietician/Nutrition Professional | 9 |
| Pharmacy | 9 |
| Oral surgery (dentists only) | 8 |
| Gynecologist/oncologist | 8 |
| Geriatric medicine | 7 |
| Neuropsychiatry | 6 |
| Cardiac surgery | 6 |
| Advanced Heart Failure and Transplant Cardiology | 5 |
| Certified nurse midwife | 5 |
| General Psychiatry | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 5 |
| Micrographic Dermatologic Surgery | 4 |
| Portable X-Ray Supplier (Billing Independently) | 4 |
| Medical Genetics and Genomics | 4 |
| Hematology | 3 |
| Sleep Medicine | 3 |
| Psychologist (billing independently) | 2 |
| Epileptologists | 2 |
| Unknown Provider | 2 |
| Maxillofacial surgery | 2 |
| Nuclear medicine | 2 |
| Osteopathic manipulative therapy | 2 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Oral Medicine | 1 |
| Medicare Diabetes Preventive Program | 1 |
| Opioid Treatment Program | 1 |
| Peripheral vascular disease | 1 |