This status report on the patient-centered medical home covers such topics as: What is a medical home? Where did the concept come from? How are medical homes assessed and paid? Do medical homes actually work? How does the health reform law encourage medical homes? The paper, funded by the Robert Wood Johnson Foundation, concludes that the medical home model has the potential to transform health care delivery, but organizations promoting the model should tread carefully because enthusiasm for the approach may not be borne out in evidence of success. Pilots should be completed and evaluated, and the model should be recalibrated before it is broadly expanded.