| Nurse practitioner | 1,385 |
| Physician assistant | 810 |
| Physical therapist (private practice) | 746 |
| Internal medicine | 633 |
| Family practice | 533 |
| Certified Registered Nurse Anesthetist (CRNA) | 449 |
| Emergency medicine | 364 |
| Licensed clinical social worker | 332 |
| Optometrist | 319 |
| Anesthesiology | 289 |
| Mental Health Counselors | 255 |
| Obstetrics/gynecology | 225 |
| Chiropractic | 223 |
| Mass Immunization Roster Billers | 160 |
| Psychiatry | 157 |
| Clinical psychologist | 153 |
| Diagnostic Radiology | 147 |
| Dermatology | 144 |
| Ophthalmology | 138 |
| Orthopedic surgery | 130 |
| Pediatric medicine | 116 |
| General surgery | 112 |
| Neurology | 106 |
| Certified clinical nurse specialist | 98 |
| Anesthesiologist Assistant | 89 |
| Occupational therapist (private practice) | 88 |
| Cardiology | 87 |
| Gastroenterology | 83 |
| Podiatry | 82 |
| Audiologist (billing independently) | 76 |
| Registered Dietician/Nutrition Professional | 75 |
| Otolaryngology | 75 |
| Pathology | 70 |
| Centralized Flu | 65 |
| Physical medicine and rehabilitation | 64 |
| Urology | 62 |
| Speech / language pathology | 49 |
| Nephrology | 48 |
| Ambulatory Surgical Center | 44 |
| Plastic and reconstructive surgery | 43 |
| Interventional Cardiology | 43 |
| Hematology/oncology | 42 |
| Hospitalist | 40 |
| Endocrinology | 38 |
| Neurosurgery | 36 |
| Pulmonary disease | 36 |
| Allergy/immunology | 31 |
| Rheumatology | 28 |
| Medical oncology | 25 |
| Pain Management | 24 |
| Pharmacy | 23 |
| Interventional Pain Management (IPM) | 23 |
| Thoracic surgery | 22 |
| Vascular surgery | 22 |
| Cardiac Electrophysiology | 19 |
| Radiation oncology | 18 |
| Marriage and Family Therapist | 18 |
| General practice | 16 |
| Independent Diagnostic Testing Facility (IDTF) | 16 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 15 |
| Critical care (intensivists) | 13 |
| Hospice and Palliative Care | 13 |
| Sports Medicine | 12 |
| Infectious disease | 12 |
| Hand surgery | 12 |
| Colorectal surgery (formerly proctology) | 11 |
| Certified nurse midwife | 11 |
| Clinical Laboratory (Billing Independently) | 11 |
| Interventional radiology | 11 |
| Surgical oncology | 9 |
| Micrographic Dermatologic Surgery | 9 |
| Dentist | 9 |
| Opioid Treatment Program | 5 |
| Geriatric medicine | 5 |
| Oral surgery (dentists only) | 4 |
| Gynecologist/oncologist | 4 |
| Preventive medicine | 4 |
| Sleep Medicine | 4 |
| Maxillofacial surgery | 3 |
| Single or Multispecialty Clinic or Group Practice | 3 |
| Addiction medicine | 3 |
| Cardiac surgery | 3 |
| Advanced Heart Failure and Transplant Cardiology | 3 |
| Psychologist (billing independently) | 3 |
| Osteopathic manipulative therapy | 2 |
| Portable X-Ray Supplier (Billing Independently) | 1 |
| General Psychiatry | 1 |
| Medical Genetics and Genomics | 1 |
| Epileptologists | 1 |
| Adult Congenital Heart Disease | 1 |