| Nurse practitioner | 848 |
| Physician assistant | 450 |
| Internal medicine | 359 |
| Family practice | 339 |
| Certified Registered Nurse Anesthetist (CRNA) | 312 |
| Physical therapist (private practice) | 256 |
| Emergency medicine | 167 |
| Anesthesiology | 151 |
| Chiropractic | 147 |
| Licensed clinical social worker | 139 |
| Optometrist | 124 |
| Centralized Flu | 93 |
| Diagnostic Radiology | 93 |
| Obstetrics/gynecology | 90 |
| Orthopedic surgery | 89 |
| Mental Health Counselors | 88 |
| Clinical psychologist | 79 |
| Occupational therapist (private practice) | 78 |
| Cardiology | 76 |
| Neurology | 75 |
| Ophthalmology | 71 |
| Mass Immunization Roster Billers | 67 |
| Hospitalist | 65 |
| Gastroenterology | 65 |
| General surgery | 63 |
| Dermatology | 62 |
| Podiatry | 61 |
| Psychiatry | 60 |
| Pathology | 42 |
| Pulmonary disease | 42 |
| Physical medicine and rehabilitation | 35 |
| Urology | 35 |
| Hematology/oncology | 35 |
| Speech / language pathology | 33 |
| Ambulatory Surgical Center | 32 |
| Otolaryngology | 31 |
| Anesthesiologist Assistant | 30 |
| Rheumatology | 27 |
| Audiologist (billing independently) | 24 |
| Nephrology | 24 |
| Interventional Cardiology | 24 |
| General practice | 22 |
| Infectious disease | 22 |
| Allergy/immunology | 21 |
| Radiation oncology | 20 |
| Endocrinology | 19 |
| Medical oncology | 18 |
| Neurosurgery | 17 |
| Pediatric medicine | 14 |
| Cardiac Electrophysiology | 14 |
| Certified nurse midwife | 12 |
| Plastic and reconstructive surgery | 12 |
| Thoracic surgery | 12 |
| Vascular surgery | 11 |
| Pharmacy | 10 |
| Interventional radiology | 10 |
| Hospice and Palliative Care | 9 |
| Marriage and Family Therapist | 9 |
| Interventional Pain Management (IPM) | 9 |
| Pain Management | 9 |
| Independent Diagnostic Testing Facility (IDTF) | 9 |
| Clinical Laboratory (Billing Independently) | 6 |
| Registered Dietician/Nutrition Professional | 6 |
| Geriatric medicine | 5 |
| Colorectal surgery (formerly proctology) | 4 |
| Oral surgery (dentists only) | 4 |
| Critical care (intensivists) | 4 |
| Portable X-Ray Supplier (Billing Independently) | 3 |
| Psychologist (billing independently) | 3 |
| Osteopathic manipulative therapy | 3 |
| Gynecologist/oncologist | 3 |
| Opioid Treatment Program | 3 |
| Hematology | 3 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 3 |
| Sports Medicine | 2 |
| Hand surgery | 2 |
| Medicare Diabetes Preventive Program | 2 |
| Cardiac surgery | 2 |
| Surgical oncology | 1 |
| Sleep Medicine | 1 |
| Nuclear medicine | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Epileptologists | 1 |
| Intensive Cardiac Rehabilitation | 1 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 1 |
| Advanced Heart Failure and Transplant Cardiology | 1 |
| Certified clinical nurse specialist | 1 |