60 specialties represented among NPPES-registered providers in ON. Counts reflect providers with a ON practice address.
| Rank | Specialty | Providers in ON | Taxonomy Code |
|---|---|---|---|
| 51 | Urology | 1 | 208800000X |
| 52 | Female Pelvic Medicine & Reconstructive Surgery | 1 | 2088F0040X |
| 53 | Thoracic Surgery (Cardiothoracic Vascular) | 1 | 208G00000X |
| 54 | Occupational Therapist | 1 | 225X00000X |
| 55 | Specialist/Technologist, Surgical | 1 | 246Z00000X |
| 56 | Physician Assistant | 1 | 363A00000X |
| 57 | Medical Physician Assistant | 1 | 363AM0700X |
| 58 | Nurse Practitioner | 1 | 363L00000X |
| 59 | Acute Care Nurse Practitioner | 1 | 363LA2100X |
| 60 | Certified Nurse Anesthetist (CRNA) | 1 | 367500000X |