| Nurse practitioner | 1,502 |
| Physician assistant | 616 |
| Internal medicine | 493 |
| Certified Registered Nurse Anesthetist (CRNA) | 375 |
| Family practice | 338 |
| Physical therapist (private practice) | 241 |
| Emergency medicine | 239 |
| Anesthesiology | 213 |
| Diagnostic Radiology | 172 |
| Licensed clinical social worker | 159 |
| Obstetrics/gynecology | 155 |
| Hospitalist | 145 |
| Chiropractic | 143 |
| Mental Health Counselors | 130 |
| Anesthesiologist Assistant | 115 |
| Optometrist | 111 |
| General surgery | 103 |
| Centralized Flu | 103 |
| Psychiatry | 100 |
| Cardiology | 97 |
| Orthopedic surgery | 96 |
| Pathology | 96 |
| Mass Immunization Roster Billers | 81 |
| Clinical psychologist | 77 |
| Gastroenterology | 72 |
| General practice | 70 |
| Ophthalmology | 70 |
| Neurology | 69 |
| Dermatology | 64 |
| Podiatry | 61 |
| Occupational therapist (private practice) | 56 |
| Urology | 54 |
| Pulmonary disease | 48 |
| Critical care (intensivists) | 43 |
| Hematology/oncology | 43 |
| Otolaryngology | 42 |
| Nephrology | 40 |
| Infectious disease | 39 |
| Radiation oncology | 38 |
| Audiologist (billing independently) | 38 |
| Ambulatory Surgical Center | 35 |
| Speech / language pathology | 34 |
| Interventional Cardiology | 34 |
| Pediatric medicine | 33 |
| Medical oncology | 32 |
| Neurosurgery | 32 |
| Physical medicine and rehabilitation | 31 |
| Endocrinology | 31 |
| Rheumatology | 24 |
| Thoracic surgery | 21 |
| Vascular surgery | 21 |
| Interventional Pain Management (IPM) | 20 |
| Allergy/immunology | 19 |
| Cardiac Electrophysiology | 18 |
| Registered Dietician/Nutrition Professional | 18 |
| Plastic and reconstructive surgery | 18 |
| Pharmacy | 16 |
| Marriage and Family Therapist | 14 |
| Certified nurse midwife | 13 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 13 |
| Pain Management | 12 |
| Interventional radiology | 12 |
| Sports Medicine | 12 |
| Hospice and Palliative Care | 10 |
| Colorectal surgery (formerly proctology) | 9 |
| Independent Diagnostic Testing Facility (IDTF) | 8 |
| Gynecologist/oncologist | 7 |
| Clinical Laboratory (Billing Independently) | 6 |
| Surgical oncology | 6 |
| Hand surgery | 6 |
| Cardiac surgery | 4 |
| Opioid Treatment Program | 4 |
| Advanced Heart Failure and Transplant Cardiology | 4 |
| Hematology | 3 |
| Psychologist (billing independently) | 3 |
| Certified clinical nurse specialist | 2 |
| Osteopathic manipulative therapy | 2 |
| Sleep Medicine | 2 |
| Preventive medicine | 2 |
| Oral surgery (dentists only) | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Neuropsychiatry | 1 |
| Home Infusion Therapy Services | 1 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 1 |
| Mammography Screening Center | 1 |
| Addiction medicine | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Medical Genetics and Genomics | 1 |
| Nuclear medicine | 1 |