| Nurse practitioner | 1,553 |
| Physician assistant | 633 |
| Internal medicine | 549 |
| Family practice | 467 |
| Physical therapist (private practice) | 458 |
| Emergency medicine | 339 |
| Anesthesiology | 272 |
| Licensed clinical social worker | 260 |
| Optometrist | 224 |
| Obstetrics/gynecology | 176 |
| Diagnostic Radiology | 165 |
| Chiropractic | 130 |
| Mass Immunization Roster Billers | 122 |
| Orthopedic surgery | 112 |
| General surgery | 109 |
| Cardiology | 104 |
| Psychiatry | 103 |
| Marriage and Family Therapist | 101 |
| Certified Registered Nurse Anesthetist (CRNA) | 89 |
| Occupational therapist (private practice) | 88 |
| Hospitalist | 87 |
| Clinical psychologist | 85 |
| Ophthalmology | 85 |
| Mental Health Counselors | 81 |
| Nephrology | 67 |
| Podiatry | 65 |
| Neurology | 63 |
| Gastroenterology | 60 |
| Physical medicine and rehabilitation | 58 |
| Centralized Flu | 58 |
| Ambulatory Surgical Center | 47 |
| Dermatology | 45 |
| Hematology/oncology | 42 |
| Pulmonary disease | 40 |
| Speech / language pathology | 39 |
| Pathology | 37 |
| Otolaryngology | 36 |
| Critical care (intensivists) | 35 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 34 |
| Pain Management | 34 |
| Pediatric medicine | 34 |
| Registered Dietician/Nutrition Professional | 33 |
| Clinical Laboratory (Billing Independently) | 33 |
| Urology | 32 |
| Infectious disease | 27 |
| Endocrinology | 26 |
| Radiation oncology | 24 |
| Interventional Cardiology | 24 |
| Audiologist (billing independently) | 21 |
| Certified nurse midwife | 20 |
| Rheumatology | 20 |
| Plastic and reconstructive surgery | 16 |
| Thoracic surgery | 15 |
| General practice | 15 |
| Neurosurgery | 15 |
| Hand surgery | 14 |
| Independent Diagnostic Testing Facility (IDTF) | 13 |
| Medical oncology | 13 |
| Vascular surgery | 12 |
| Cardiac Electrophysiology | 11 |
| Interventional Pain Management (IPM) | 10 |
| Geriatric medicine | 8 |
| Sports Medicine | 8 |
| Osteopathic manipulative therapy | 8 |
| Opioid Treatment Program | 8 |
| Allergy/immunology | 7 |
| Surgical oncology | 6 |
| Interventional radiology | 5 |
| Oral surgery (dentists only) | 5 |
| Micrographic Dermatologic Surgery | 4 |
| Unknown Provider | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Portable X-Ray Supplier (Billing Independently) | 4 |
| Pharmacy | 4 |
| Sleep Medicine | 4 |
| Preventive medicine | 3 |
| Gynecologist/oncologist | 3 |
| Hospice and Palliative Care | 3 |
| Anesthesiologist Assistant | 3 |
| Unknown physician specialty | 3 |
| Single or Multispecialty Clinic or Group Practice | 2 |
| Maxillofacial surgery | 2 |
| Dentist | 2 |
| Certified clinical nurse specialist | 2 |
| Psychologist (billing independently) | 2 |
| Intensive Cardiac Rehabilitation | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Cardiac surgery | 1 |
| General Psychiatry | 1 |
| Addiction medicine | 1 |