CMS Impact File Hospital Inpatient Prospective Payment System (IPPS)
CMS describes the impact files as "generally prepared in the summer preceding the Federal Fiscal year and are based on the best data available at the time. The files are used in estimating payment impacts of various policy changes to the IPPS proposed and finalized in the Federal Register."
The 1994-on files contain variables such as
A researcher kindly shared the 1986-1993 data from long ago downloads.
Jean Roth gathered many source files and documentation and set up the impact[CCYY].[dta|sas7bdat|csv] versions of the source Impact files with consistent file and variable names and variable types over time to make the files easier to use. Additional source materials gratefully accepted.
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