| Nurse practitioner | 439 |
| Physician assistant | 435 |
| Physical therapist (private practice) | 211 |
| Family practice | 189 |
| Certified Registered Nurse Anesthetist (CRNA) | 155 |
| Licensed clinical social worker | 106 |
| Internal medicine | 94 |
| Chiropractic | 90 |
| Emergency medicine | 90 |
| Optometrist | 83 |
| Mental Health Counselors | 70 |
| Diagnostic Radiology | 51 |
| Orthopedic surgery | 47 |
| Obstetrics/gynecology | 46 |
| Anesthesiology | 38 |
| Hospitalist | 37 |
| General surgery | 35 |
| Audiologist (billing independently) | 31 |
| Clinical psychologist | 27 |
| Psychiatry | 27 |
| Mass Immunization Roster Billers | 25 |
| Urology | 23 |
| Pulmonary disease | 23 |
| Neurology | 22 |
| Ophthalmology | 21 |
| Pediatric medicine | 18 |
| Gastroenterology | 18 |
| Registered Dietician/Nutrition Professional | 17 |
| Centralized Flu | 17 |
| Physical medicine and rehabilitation | 17 |
| Pathology | 16 |
| Dermatology | 16 |
| Cardiology | 14 |
| Podiatry | 13 |
| Neurosurgery | 12 |
| Otolaryngology | 12 |
| Ambulatory Surgical Center | 12 |
| Occupational therapist (private practice) | 11 |
| Interventional Cardiology | 11 |
| Pain Management | 11 |
| Speech / language pathology | 10 |
| Sports Medicine | 9 |
| Thoracic surgery | 8 |
| Critical care (intensivists) | 8 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 8 |
| Medical oncology | 7 |
| Plastic and reconstructive surgery | 7 |
| Vascular surgery | 7 |
| Certified nurse midwife | 7 |
| Nephrology | 7 |
| Pharmacy | 7 |
| Marriage and Family Therapist | 6 |
| Rheumatology | 6 |
| Hand surgery | 5 |
| Allergy/immunology | 5 |
| Hematology/oncology | 5 |
| Cardiac Electrophysiology | 4 |
| Endocrinology | 4 |
| Infectious disease | 4 |
| Colorectal surgery (formerly proctology) | 4 |
| Hospice and Palliative Care | 3 |
| Certified clinical nurse specialist | 3 |
| Radiation oncology | 3 |
| Oral surgery (dentists only) | 2 |
| Sleep Medicine | 2 |
| Interventional radiology | 2 |
| Geriatric medicine | 2 |
| Interventional Pain Management (IPM) | 2 |
| Unknown Provider | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Radiation Therapy Centers | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| General Psychiatry | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Unknown physician specialty | 1 |
| Gynecologist/oncologist | 1 |
| Maxillofacial surgery | 1 |
| General practice | 1 |
| Epileptologists | 1 |
| Surgical oncology | 1 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Neuropsychiatry | 1 |
| Nuclear medicine | 1 |
| Dentist | 1 |