| Nurse practitioner | 1,872 |
| Family practice | 750 |
| Physical therapist (private practice) | 499 |
| Certified Registered Nurse Anesthetist (CRNA) | 492 |
| Internal medicine | 429 |
| Licensed clinical social worker | 354 |
| Physician assistant | 354 |
| Mental Health Counselors | 273 |
| Mass Immunization Roster Billers | 267 |
| Optometrist | 251 |
| Emergency medicine | 225 |
| Chiropractic | 207 |
| Diagnostic Radiology | 182 |
| Anesthesiology | 171 |
| Obstetrics/gynecology | 169 |
| General surgery | 141 |
| Psychiatry | 119 |
| Orthopedic surgery | 116 |
| Occupational therapist (private practice) | 103 |
| Cardiology | 95 |
| Pediatric medicine | 82 |
| Pathology | 74 |
| Neurology | 67 |
| Ophthalmology | 64 |
| Clinical psychologist | 63 |
| Pharmacy | 62 |
| Gastroenterology | 57 |
| Ambulatory Surgical Center | 57 |
| Dermatology | 51 |
| Otolaryngology | 49 |
| Hematology/oncology | 49 |
| Pulmonary disease | 47 |
| Podiatry | 47 |
| Nephrology | 47 |
| Speech / language pathology | 47 |
| Neurosurgery | 43 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 42 |
| Centralized Flu | 39 |
| Urology | 38 |
| Audiologist (billing independently) | 37 |
| Interventional Cardiology | 36 |
| Hospitalist | 34 |
| Endocrinology | 32 |
| Radiation oncology | 29 |
| Registered Dietician/Nutrition Professional | 28 |
| Infectious disease | 26 |
| Physical medicine and rehabilitation | 26 |
| Certified clinical nurse specialist | 26 |
| Rheumatology | 25 |
| General practice | 23 |
| Clinical Laboratory (Billing Independently) | 21 |
| Pain Management | 20 |
| Thoracic surgery | 20 |
| Interventional radiology | 19 |
| Plastic and reconstructive surgery | 19 |
| Medical oncology | 16 |
| Allergy/immunology | 16 |
| Geriatric medicine | 16 |
| Cardiac Electrophysiology | 13 |
| Independent Diagnostic Testing Facility (IDTF) | 12 |
| Vascular surgery | 12 |
| Critical care (intensivists) | 11 |
| Cardiac surgery | 11 |
| Certified nurse midwife | 10 |
| Hospice and Palliative Care | 10 |
| Hand surgery | 9 |
| Marriage and Family Therapist | 9 |
| Colorectal surgery (formerly proctology) | 8 |
| Sports Medicine | 8 |
| Interventional Pain Management (IPM) | 7 |
| Surgical oncology | 6 |
| Gynecologist/oncologist | 6 |
| Hematology | 5 |
| Oral surgery (dentists only) | 4 |
| Home Infusion Therapy Services | 3 |
| Opioid Treatment Program | 3 |
| General Psychiatry | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Nuclear medicine | 3 |
| Dentist | 3 |
| Sleep Medicine | 3 |
| Portable X-Ray Supplier (Billing Independently) | 3 |
| Micrographic Dermatologic Surgery | 2 |
| Addiction medicine | 2 |
| Preventive medicine | 2 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Radiation Therapy Centers | 1 |
| Undersea and Hyperbaric Medicine | 1 |
| Osteopathic manipulative therapy | 1 |