Specialty Codes of the Dominant Providers
| Provider Specialty Code | Description of the Provider Specialty Code | Percentage of Beneficiaries in the Study with this Dominant Provider |
|---|---|---|
| 11 | Physician/Internal Medicine* | 35.4 |
| 8 | Physician/Family Practice* | 17.9 |
| 18 | Physician/Ophthalmology | 7.4 |
| 6 | Physician/Cardiovascular Disease† | 6.0 |
| 7 | Physician/Dermatology | 4.0 |
| 20 | Physician/Orthopedic Surgery | 3.6 |
| 34 | Physician/Urology | 3.1 |
| 29 | Physician/Pulmonary Disease | 1.7 |
| 39 | Physician/Nephrology | 1.6 |
| 4 | Physician/Otolaryngology | 1.4 |
| 48 | Podiatry | 1.4 |
| 1 | Physician/General Practice* | 1.3 |
| 41 | Optometry | 1.3 |
| 10 | Physician/Gastroenterology | 1.1 |
| 83 | Physician/Hematology-Oncology‡ | 1.1 |
| 90 | Physician/Medical Oncology‡ | 0.7 |
| 16 | Physician/Obstetrics & Gynecology | 0.6 |
| 38 | Physician/Geriatric Medicine | 0.6 |
| 46 | Physician/Endocrinology | 0.6 |
| 66 | Physician/Rheumatology | 0.6 |
Notes: Provider specialty codes representing ≤0.5% of beneficiaries were suppressed.
↵* Primary care combines ‘1’,‘8’,‘11’. Provider specialty code ‘11’ includes individuals whose primary specialty is internal medicine.
↵† Cardiology combines ‘6’, and ‘78’.
↵‡ Oncology combines ‘83’,‘90’,‘91’,‘92’. Provider specialty code ‘92’ had 0.2%, ‘91’ had 0.1%, and ‘78’ had 0.1% of beneficiaries.