| Physical therapist (private practice) | 198 |
| Physician assistant | 172 |
| Nurse practitioner | 161 |
| Family practice | 125 |
| Internal medicine | 71 |
| Licensed clinical social worker | 64 |
| Mental Health Counselors | 59 |
| Anesthesiology | 52 |
| Emergency medicine | 44 |
| Chiropractic | 43 |
| Clinical psychologist | 42 |
| Optometrist | 33 |
| Orthopedic surgery | 29 |
| Certified Registered Nurse Anesthetist (CRNA) | 28 |
| Obstetrics/gynecology | 25 |
| Occupational therapist (private practice) | 25 |
| Psychiatry | 24 |
| General surgery | 24 |
| Ophthalmology | 22 |
| Dermatology | 19 |
| Audiologist (billing independently) | 19 |
| Hospitalist | 18 |
| Gastroenterology | 18 |
| Mass Immunization Roster Billers | 17 |
| Otolaryngology | 15 |
| Diagnostic Radiology | 15 |
| Physical medicine and rehabilitation | 13 |
| Pathology | 12 |
| Pulmonary disease | 11 |
| Certified nurse midwife | 11 |
| Speech / language pathology | 11 |
| Centralized Flu | 9 |
| Hematology/oncology | 9 |
| Neurology | 9 |
| Cardiology | 8 |
| Registered Dietician/Nutrition Professional | 7 |
| Interventional Cardiology | 7 |
| Independent Diagnostic Testing Facility (IDTF) | 7 |
| Urology | 7 |
| Neurosurgery | 7 |
| Nephrology | 6 |
| Radiation oncology | 6 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 6 |
| Allergy/immunology | 6 |
| Rheumatology | 5 |
| Sleep Medicine | 5 |
| Ambulatory Surgical Center | 5 |
| Endocrinology | 5 |
| Marriage and Family Therapist | 4 |
| Sports Medicine | 4 |
| Podiatry | 3 |
| Infectious disease | 3 |
| Critical care (intensivists) | 3 |
| Pain Management | 2 |
| Gynecologist/oncologist | 2 |
| Thoracic surgery | 2 |
| Medical oncology | 2 |
| Interventional Pain Management (IPM) | 2 |
| Hospice and Palliative Care | 2 |
| Hand surgery | 2 |
| Plastic and reconstructive surgery | 2 |
| Micrographic Dermatologic Surgery | 1 |
| Opioid Treatment Program | 1 |
| Neuropsychiatry | 1 |
| Pediatric medicine | 1 |
| Colorectal surgery (formerly proctology) | 1 |
| Vascular surgery | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Addiction medicine | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Osteopathic manipulative therapy | 1 |
| General practice | 1 |
| Oral surgery (dentists only) | 1 |
| Anesthesiologist Assistant | 1 |