The primary care medical home (PCMH), also referred to as the patient centered medical home, advanced primary care, and the healthcare home, is a model that holds promise as a way to improve health care by transforming how primary care is organized and delivered. Building on the work of a large and growing community, the Agency for Healthcare Research and Quality (AHRQ) defines a medical home not simply as a place but as a model of the organization of primary care that delivers the core functions of primary health care. The model aims to provide patients with comprehensive care that is patient-centered, coordinated, accessible, and high quality. For more information, visit http://pcmh.ahrq.gov.