Group medical practices practice medicine by physicians who share resources. There are approximately 230,187 physician practices in the United States. Among the physician practices, 16.5% had only one office-based physician in 2016. Physician group practices with 2-4 physicians make up 22.3% of physician offices in the United States, 19.8% have 5-10 physicians, 12.1% have 11-24 physicians, 6.3% have 25–49, and the remaining 13.5% have 50 or more physicians. In recent years, many small or solo practitioners have come together to form larger specialty groups because of managed care.