| Nurse practitioner | 2,395 |
| Internal medicine | 958 |
| Physician assistant | 548 |
| Family practice | 527 |
| Certified Registered Nurse Anesthetist (CRNA) | 482 |
| Emergency medicine | 380 |
| Anesthesiology | 363 |
| Physical therapist (private practice) | 347 |
| Diagnostic Radiology | 310 |
| General practice | 264 |
| Obstetrics/gynecology | 261 |
| Cardiology | 211 |
| Psychiatry | 194 |
| Neurology | 175 |
| Ophthalmology | 175 |
| Centralized Flu | 166 |
| Podiatry | 164 |
| Clinical psychologist | 163 |
| General surgery | 162 |
| Hospitalist | 154 |
| Mass Immunization Roster Billers | 153 |
| Optometrist | 139 |
| Orthopedic surgery | 133 |
| Dermatology | 131 |
| Gastroenterology | 128 |
| Licensed clinical social worker | 124 |
| Mental Health Counselors | 121 |
| Hematology/oncology | 116 |
| Pathology | 104 |
| Pulmonary disease | 100 |
| Pediatric medicine | 93 |
| Urology | 93 |
| Occupational therapist (private practice) | 83 |
| Chiropractic | 78 |
| Infectious disease | 75 |
| Nephrology | 72 |
| Physical medicine and rehabilitation | 70 |
| Otolaryngology | 67 |
| Endocrinology | 64 |
| Critical care (intensivists) | 58 |
| Anesthesiologist Assistant | 45 |
| Radiation oncology | 44 |
| Plastic and reconstructive surgery | 43 |
| Neurosurgery | 43 |
| Rheumatology | 42 |
| Independent Diagnostic Testing Facility (IDTF) | 38 |
| Ambulatory Surgical Center | 33 |
| Interventional radiology | 32 |
| Vascular surgery | 30 |
| Thoracic surgery | 29 |
| Interventional Cardiology | 28 |
| Allergy/immunology | 28 |
| Cardiac Electrophysiology | 26 |
| Speech / language pathology | 26 |
| Clinical Laboratory (Billing Independently) | 23 |
| Surgical oncology | 22 |
| Pain Management | 21 |
| Hand surgery | 19 |
| Colorectal surgery (formerly proctology) | 19 |
| Audiologist (billing independently) | 18 |
| Marriage and Family Therapist | 16 |
| Medical oncology | 16 |
| Hospice and Palliative Care | 15 |
| Neuropsychiatry | 14 |
| Pharmacy | 14 |
| Interventional Pain Management (IPM) | 13 |
| Sports Medicine | 13 |
| Registered Dietician/Nutrition Professional | 12 |
| Gynecologist/oncologist | 10 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 10 |
| Geriatric medicine | 9 |
| Oral surgery (dentists only) | 8 |
| Certified nurse midwife | 8 |
| Cardiac surgery | 8 |
| Sleep Medicine | 7 |
| Hematology | 6 |
| Advanced Heart Failure and Transplant Cardiology | 6 |
| Medical Genetics and Genomics | 6 |
| General Psychiatry | 6 |
| Portable X-Ray Supplier (Billing Independently) | 5 |
| Micrographic Dermatologic Surgery | 4 |
| Psychologist (billing independently) | 4 |
| Maxillofacial surgery | 4 |
| Osteopathic manipulative therapy | 4 |
| Nuclear medicine | 3 |
| Epileptologists | 2 |
| Unknown Provider | 2 |
| Single or Multispecialty Clinic or Group Practice | 2 |
| Oral Medicine | 2 |
| Medicare Diabetes Preventive Program | 1 |
| Opioid Treatment Program | 1 |
| Peripheral vascular disease | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Preventive medicine | 1 |