| Nurse practitioner | 3,157 |
| Certified Registered Nurse Anesthetist (CRNA) | 1,009 |
| Family practice | 892 |
| Internal medicine | 866 |
| Physical therapist (private practice) | 850 |
| Physician assistant | 636 |
| Emergency medicine | 409 |
| Optometrist | 347 |
| Anesthesiology | 341 |
| Chiropractic | 340 |
| Mass Immunization Roster Billers | 314 |
| Obstetrics/gynecology | 303 |
| Diagnostic Radiology | 256 |
| General surgery | 235 |
| Orthopedic surgery | 232 |
| Licensed clinical social worker | 195 |
| Mental Health Counselors | 174 |
| Psychiatry | 164 |
| Centralized Flu | 153 |
| Cardiology | 147 |
| Ophthalmology | 142 |
| Neurology | 140 |
| Occupational therapist (private practice) | 132 |
| Gastroenterology | 131 |
| Pulmonary disease | 121 |
| Hospitalist | 116 |
| Otolaryngology | 103 |
| Dermatology | 102 |
| Urology | 100 |
| Pharmacy | 99 |
| Pathology | 98 |
| Nephrology | 92 |
| Pediatric medicine | 90 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 89 |
| Clinical psychologist | 85 |
| Hematology/oncology | 82 |
| Podiatry | 79 |
| Speech / language pathology | 71 |
| Audiologist (billing independently) | 70 |
| Physical medicine and rehabilitation | 63 |
| Clinical Laboratory (Billing Independently) | 57 |
| Rheumatology | 57 |
| Infectious disease | 56 |
| Neurosurgery | 49 |
| Interventional Cardiology | 41 |
| Endocrinology | 41 |
| Vascular surgery | 37 |
| Radiation oncology | 35 |
| General practice | 35 |
| Independent Diagnostic Testing Facility (IDTF) | 34 |
| Critical care (intensivists) | 31 |
| Plastic and reconstructive surgery | 31 |
| Ambulatory Surgical Center | 30 |
| Medical oncology | 30 |
| Thoracic surgery | 25 |
| Registered Dietician/Nutrition Professional | 19 |
| Oral surgery (dentists only) | 19 |
| Surgical oncology | 18 |
| Allergy/immunology | 18 |
| Cardiac Electrophysiology | 18 |
| Sports Medicine | 17 |
| Interventional Pain Management (IPM) | 15 |
| Anesthesiologist Assistant | 14 |
| Cardiac surgery | 14 |
| Opioid Treatment Program | 14 |
| Pain Management | 14 |
| Interventional radiology | 11 |
| Hospice and Palliative Care | 10 |
| Colorectal surgery (formerly proctology) | 10 |
| Certified nurse midwife | 9 |
| Geriatric medicine | 9 |
| Gynecologist/oncologist | 8 |
| Hand surgery | 8 |
| Marriage and Family Therapist | 7 |
| Maxillofacial surgery | 7 |
| Sleep Medicine | 6 |
| Advanced Heart Failure and Transplant Cardiology | 6 |
| Home Infusion Therapy Services | 6 |
| Unknown Provider | 5 |
| All other suppliers, e.g., Drug Stores | 4 |
| Psychologist (billing independently) | 4 |
| Nuclear medicine | 4 |
| Medical Genetics and Genomics | 3 |
| Preventive medicine | 3 |
| Addiction medicine | 3 |
| Osteopathic manipulative therapy | 3 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 3 |
| Single or Multispecialty Clinic or Group Practice | 2 |
| Micrographic Dermatologic Surgery | 2 |
| Portable X-Ray Supplier (Billing Independently) | 2 |
| Certified clinical nurse specialist | 2 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Medical Toxicology | 1 |