| Nurse practitioner | 783 |
| Physical therapist (private practice) | 744 |
| Internal medicine | 564 |
| Physician assistant | 439 |
| Licensed clinical social worker | 293 |
| Anesthesiology | 290 |
| Chiropractic | 236 |
| Emergency medicine | 207 |
| Family practice | 192 |
| Obstetrics/gynecology | 180 |
| Occupational therapist (private practice) | 161 |
| Cardiology | 143 |
| Psychiatry | 141 |
| Optometrist | 140 |
| Podiatry | 140 |
| Diagnostic Radiology | 138 |
| Clinical psychologist | 117 |
| Orthopedic surgery | 116 |
| Ophthalmology | 104 |
| Mass Immunization Roster Billers | 101 |
| Gastroenterology | 100 |
| Neurology | 93 |
| Certified Registered Nurse Anesthetist (CRNA) | 91 |
| General surgery | 90 |
| Physical medicine and rehabilitation | 76 |
| Mental Health Counselors | 66 |
| Dermatology | 63 |
| Pulmonary disease | 59 |
| Pediatric medicine | 57 |
| Endocrinology | 55 |
| Hematology/oncology | 52 |
| Nephrology | 48 |
| Urology | 47 |
| Centralized Flu | 44 |
| Otolaryngology | 41 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 41 |
| Pathology | 40 |
| Ambulatory Surgical Center | 39 |
| Audiologist (billing independently) | 36 |
| Plastic and reconstructive surgery | 33 |
| Rheumatology | 32 |
| Registered Dietician/Nutrition Professional | 30 |
| Neurosurgery | 30 |
| Critical care (intensivists) | 29 |
| Hospitalist | 29 |
| Allergy/immunology | 29 |
| Pharmacy | 25 |
| Infectious disease | 25 |
| Vascular surgery | 25 |
| Speech / language pathology | 23 |
| Interventional Cardiology | 22 |
| Pain Management | 21 |
| Medical oncology | 19 |
| Radiation oncology | 16 |
| Cardiac Electrophysiology | 14 |
| Clinical Laboratory (Billing Independently) | 12 |
| Geriatric medicine | 11 |
| Colorectal surgery (formerly proctology) | 11 |
| Independent Diagnostic Testing Facility (IDTF) | 10 |
| Interventional radiology | 10 |
| Thoracic surgery | 10 |
| Marriage and Family Therapist | 9 |
| Hand surgery | 9 |
| Cardiac surgery | 9 |
| General practice | 8 |
| Surgical oncology | 7 |
| Certified nurse midwife | 6 |
| Gynecologist/oncologist | 6 |
| Oral surgery (dentists only) | 6 |
| Interventional Pain Management (IPM) | 5 |
| Sports Medicine | 5 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Dentist | 4 |
| Hospice and Palliative Care | 4 |
| Maxillofacial surgery | 4 |
| Nuclear medicine | 3 |
| Osteopathic manipulative therapy | 3 |
| Certified clinical nurse specialist | 2 |
| General Psychiatry | 2 |
| Opioid Treatment Program | 2 |
| Neuropsychiatry | 2 |
| Sleep Medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Unknown Provider | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Psychologist (billing independently) | 1 |
| Home Infusion Therapy Services | 1 |
| Hematology | 1 |
| Preventive medicine | 1 |
| Addiction medicine | 1 |