The concept of a medical home is receiving increased attention as a potential means to improve care and reduce costs. This study describes the characteristics and capabilities of practices that have achieved recognition of National Committee for Quality Assurance as a "patient-centered medical home" (PCMH). Both small and large practices demonstrate capabilities related to the goals of PCMH of accessible, coordinated, and patient-centered care; however, practices affiliated with larger organizations achieve higher levels of PCMH recognition compared with unaffiliated small practices. Efforts to support practices to implement medical home capabilities are needed, particularly in the use of data for population management and patient self-management.