Using original survey data and secondary analyses of data from the American Hospital Association and the Centers for Medicare & Medicaid Services, this is an index of hospital quality updated on an annual basis. This index has three components representing three critical care structure, process, and outcome aspects. More than 900 hospitals are listed in Cancer. All are experienced in treating complex cases—a hospital is listed only if at least 417 inpatients who needed a high level of expertise in this specialty were treated there or if surveyed specialists recommended the hospital for such patients. The top 50 hospitals are ranked by score. Those below the top 50 are listed alphabetically.