Inpatient Definitions and Methodology

Statistics for the Top 20 MS-DRGs

All information in this report is taken from the Medicare Provider Analysis and Review (MedPAR) file which is updated annually by CMS based on the federal fiscal year.  The file includes billing data for 100% of all Medicare fee-for-service claims (IPPS claims) for discharges during the twelve months ending September 30.  The report is based on the most recent periods available and is consistent with CMS Data Release policies. Please note that a new MS-DRG patient classification system was introduced in FY 2008. The new MS-DRGs replace prior DRG definitions and MS-DRGs are not compatible with the prior DRGs.

The twenty base MS-DRGs with the highest numbers of discharges are ranked by volume and the remaining MS-DRGs are summarized:

A brief description of the Medicare Prospective Payment System is provided to explain the system, MS-DRGs, the case mix index, etc.