| Nurse practitioner | 2,597 |
| Physician assistant | 1,614 |
| Physical therapist (private practice) | 1,086 |
| Internal medicine | 921 |
| Family practice | 736 |
| Anesthesiology | 475 |
| Emergency medicine | 442 |
| Certified Registered Nurse Anesthetist (CRNA) | 424 |
| Diagnostic Radiology | 410 |
| Chiropractic | 374 |
| Optometrist | 297 |
| Obstetrics/gynecology | 233 |
| Licensed clinical social worker | 229 |
| Orthopedic surgery | 224 |
| General surgery | 206 |
| Podiatry | 205 |
| Mental Health Counselors | 198 |
| Mass Immunization Roster Billers | 192 |
| Cardiology | 188 |
| Neurology | 182 |
| Hospitalist | 178 |
| Psychiatry | 178 |
| Clinical psychologist | 160 |
| Dermatology | 154 |
| Gastroenterology | 150 |
| Occupational therapist (private practice) | 149 |
| Ophthalmology | 131 |
| Nephrology | 122 |
| Centralized Flu | 105 |
| Pathology | 103 |
| Ambulatory Surgical Center | 99 |
| Hematology/oncology | 98 |
| Registered Dietician/Nutrition Professional | 93 |
| Critical care (intensivists) | 91 |
| Speech / language pathology | 82 |
| Pulmonary disease | 79 |
| Otolaryngology | 79 |
| Audiologist (billing independently) | 78 |
| Urology | 74 |
| Physical medicine and rehabilitation | 74 |
| Interventional Cardiology | 72 |
| Endocrinology | 60 |
| Neurosurgery | 58 |
| Infectious disease | 57 |
| Radiation oncology | 56 |
| Pediatric medicine | 53 |
| Clinical Laboratory (Billing Independently) | 43 |
| Certified nurse midwife | 40 |
| Pain Management | 35 |
| Plastic and reconstructive surgery | 34 |
| Vascular surgery | 33 |
| Rheumatology | 32 |
| Allergy/immunology | 31 |
| Medical oncology | 28 |
| General practice | 28 |
| Cardiac Electrophysiology | 26 |
| Colorectal surgery (formerly proctology) | 24 |
| Marriage and Family Therapist | 24 |
| Hand surgery | 22 |
| Interventional radiology | 21 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 20 |
| Hospice and Palliative Care | 20 |
| Pharmacy | 19 |
| Interventional Pain Management (IPM) | 17 |
| Oral surgery (dentists only) | 16 |
| Surgical oncology | 15 |
| Cardiac surgery | 15 |
| Thoracic surgery | 14 |
| Sports Medicine | 14 |
| Opioid Treatment Program | 13 |
| Independent Diagnostic Testing Facility (IDTF) | 12 |
| Geriatric medicine | 12 |
| Sleep Medicine | 12 |
| Gynecologist/oncologist | 9 |
| Epileptologists | 9 |
| Dentist | 6 |
| Maxillofacial surgery | 6 |
| Micrographic Dermatologic Surgery | 5 |
| Portable X-Ray Supplier (Billing Independently) | 5 |
| Unknown physician specialty | 5 |
| Hematology | 5 |
| Osteopathic manipulative therapy | 5 |
| Nuclear medicine | 4 |
| Certified clinical nurse specialist | 3 |
| Intensive Cardiac Rehabilitation | 2 |
| Unknown Provider | 2 |
| Psychologist (billing independently) | 2 |
| Preventive medicine | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Medical Genetics and Genomics | 2 |
| Neuropsychiatry | 2 |
| Hematopoietic Cell Transplantation and Cellular Therapy | 2 |
| Addiction medicine | 2 |
| Undersea and Hyperbaric Medicine | 2 |
| Home Infusion Therapy Services | 1 |
| Medical Toxicology | 1 |
| Medicare Diabetes Preventive Program | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Orofacial Pain | 1 |