Researchers at the RAND Corporation will reprice commercial medical claims from MHDO using Medicare's groupers and pricing algorithms and will release a public research report that includes commercial prices as a percent of Medicare prices for hospitals and hospital systems identified by name. This research report will update and expand on the findings in a RAND reports released in May, 2019 (https://www.rand.org/pubs/research_reports/RR3033.html) and September 2020 (https://www.rand.org/pubs/research_reports/RR4394.html). The public research report will include hospitals from around the country and will be created using claims data from three sources: selfinsured employers, state-based all payer claims databases (APCDs), and health plans. Benefit to Citizens of Washington: This project will benefit the people of Washington by providing them with a detailed hospital price report for hospitals in Washington, as well as comparisons among hospitals in Washington versus hospitals in other states. Key audiences for the report will be (1) self-insured employers that participate in the study and that are assessing the reasonableness of the prices they are paying for hospital care, (2) other employers that are struggling with high and rising health care costs and that want to better understand patterns and trends in hospital prices, and (3) policymakers and researchers who are concerned with hospital pricing and price transparency.