Centers for Medicare & Medicaid Services (CMS) Casemix File Hospital IPPS

Last Updated August 2023

Source CMS

CMS describes the casemix files in the following way: "This file contains hospitals case mix indexes (CMI) for discharges. A hospital's CMI represents the average diagnosis-related group (DRG) relative weight for that hospital. It is calculated by summing the DRG weights for all Medicare discharges and dividing by the number of discharges. CMIs are calculated using both transfer-adjusted cases and unadjusted cases."

NBER affiliates can access this and other data through the NBER computing system. Files can be located using the directory path of each download link by replacing "https://data.nber.org/" with "/homes/data/". For example, these CMS case mix datasets can be found under "/homes/data/casemix/" on the internal NBER computer cluster. For more information on the data available on the internal server see NBER Internal Data Collection page.

The casemix variables are also available in the CMS Impact file, and the impact file includes earlier years of data as well.

Data

Year	Stata	SAS	CSV	Source Materials		Description
2024	dta	sas7bdat	csv	zip	txt	desc
2023	dta	sas7bdat	csv	zip	txt	desc
2022	dta	sas7bdat	csv	zip	txt	desc
2021	dta	sas7bdat	csv	zip	txt	desc
2020	dta	sas7bdat	csv	zip	txt	desc
2019	dta	sas7bdat	csv	zip	txt	desc
2018	dta	sas7bdat	csv	zip	txt	desc
2017	dta	sas7bdat	csv	zip	txt	desc
2016	dta	sas7bdat	csv	zip	txt	desc
2015	dta	sas7bdat	csv	zip	txt	desc
2014	dta	sas7bdat	csv	zip	txt	desc
2013	dta	sas7bdat	csv	zip	txt	desc
2012	dta	sas7bdat	csv	zip	txt	desc
2011	dta	sas7bdat	csv	zip	txt	desc
2010	dta	sas7bdat	csv	zip	txt	desc
2009	dta	sas7bdat	csv	zip	txt	desc
2008	dta	sas7bdat	csv	zip	txt	desc
2007	dta	sas7bdat	csv	zip	txt	desc
2006	dta	sas7bdat	csv	zip	txt	desc
2005	dta	sas7bdat	csv	zip	txt	desc
2004	dta	sas7bdat	csv	zip	txt	desc
2003	dta	sas7bdat	csv	zip	txt	desc
2002	dta	sas7bdat	csv	zip	txt	desc