The National Center for Health Statistics site includes explanations about data access and use. Data from CDC Wonder and WISQARS is available. Data about diseases and conditions are available for ten broad topics, including diabetes, cardiovascular, and dementia and mental health.
SAMHSA has prioritized data, outcomes and quality - realizing an integrated data strategy and a national framework for quality improvement in behavioral health care will inform policy, measure program impact, and lead to improved quality of services and outcomes of individuals, families, and communities. Data helps SAMHSA and the nation assess the impact of the changes to US health care systems and identify and address behavioral health disparities.
"The National Health and Nutrition Examination Survey (NHANES) is a program of studies designed to assess the health and nutritional status of adults and children in the United States. The survey is unique in that it combines interviews and physical examinations."
Healthcare cost and utilization project (HCUPnet) is a freely available statistical information on community hospital information covering: hospital stays, conditions, costs including Medicare, Medicaid, private, and uninsured patients.
The National Hospital Care Survey (NHCS) is designed to provide accurate and reliable health care statistics that answer key questions of interest to health care and public health professionals, researchers and health care policy makers.
The GHO "By category" view provides data classified according to health related topics. Relevant indicators are grouped together in the various data views in order to provide broader context for the information provided.