The primary data sources for this report include the American Medical Association 2011 Physician Masterfile, population estimates from the U.S. Census Bureau and the AAMC/AMA National Graduate Medical Education Census.
The top five specialties with the largest number of active physicians in 2010 were:
1. Internal Medicine — 109,048
2. Family Medicine/General Practice — 106,549
3. Pediatrics — 55,509
4. Obstetrics & Gynecology — 40,377
5. Anesthesiology — 40,123
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