| Nurse practitioner | 1,024 |
| Physician assistant | 582 |
| Internal medicine | 313 |
| Family practice | 299 |
| Licensed clinical social worker | 296 |
| Physical therapist (private practice) | 266 |
| Mental Health Counselors | 206 |
| Certified Registered Nurse Anesthetist (CRNA) | 196 |
| Emergency medicine | 186 |
| Optometrist | 129 |
| Clinical psychologist | 124 |
| Anesthesiology | 120 |
| Chiropractic | 116 |
| Orthopedic surgery | 108 |
| Mass Immunization Roster Billers | 104 |
| Diagnostic Radiology | 99 |
| Psychiatry | 97 |
| Obstetrics/gynecology | 92 |
| General surgery | 82 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 79 |
| Hospitalist | 62 |
| Cardiology | 61 |
| Gastroenterology | 52 |
| Ophthalmology | 51 |
| Neurology | 49 |
| Podiatry | 41 |
| Pediatric medicine | 40 |
| Dermatology | 38 |
| Pathology | 38 |
| Certified nurse midwife | 37 |
| Occupational therapist (private practice) | 37 |
| Audiologist (billing independently) | 34 |
| Urology | 31 |
| Rheumatology | 27 |
| Hematology/oncology | 25 |
| Otolaryngology | 25 |
| Physical medicine and rehabilitation | 25 |
| Pulmonary disease | 24 |
| Centralized Flu | 23 |
| Registered Dietician/Nutrition Professional | 21 |
| Radiation oncology | 21 |
| Infectious disease | 21 |
| Vascular surgery | 20 |
| Endocrinology | 20 |
| Marriage and Family Therapist | 19 |
| Critical care (intensivists) | 18 |
| Ambulatory Surgical Center | 18 |
| Neurosurgery | 16 |
| Nephrology | 14 |
| Thoracic surgery | 13 |
| Plastic and reconstructive surgery | 13 |
| Interventional Cardiology | 12 |
| Medical oncology | 11 |
| Pain Management | 9 |
| Geriatric medicine | 9 |
| Independent Diagnostic Testing Facility (IDTF) | 9 |
| Hospice and Palliative Care | 9 |
| Interventional radiology | 7 |
| Pharmacy | 7 |
| Sports Medicine | 6 |
| Osteopathic manipulative therapy | 6 |
| Speech / language pathology | 6 |
| Allergy/immunology | 6 |
| Hand surgery | 6 |
| Colorectal surgery (formerly proctology) | 5 |
| General Psychiatry | 5 |
| Cardiac Electrophysiology | 4 |
| Opioid Treatment Program | 4 |
| Sleep Medicine | 4 |
| General practice | 3 |
| Nuclear medicine | 3 |
| Single or Multispecialty Clinic or Group Practice | 3 |
| Hematology | 3 |
| Oral surgery (dentists only) | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Cardiac surgery | 2 |
| Unknown Provider | 1 |
| Gynecologist/oncologist | 1 |
| Preventive medicine | 1 |
| Radiation Therapy Centers | 1 |
| Dentist | 1 |
| Certified clinical nurse specialist | 1 |
| Psychologist (billing independently) | 1 |
| Maxillofacial surgery | 1 |
| Undersea and Hyperbaric Medicine | 1 |