Inpatient Definitions and Methodology
Statistics for the Top 20 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 for discharges during the twelve months ending September 30. The report is based on the most recent period available and is consistent with CMS Data Release policies. Please note that a new MS-DRG patient classification system was introduced in FY 2008. This system replaced the prior DRG definitions and is no longer compatible with the DRGs reported here.
The twenty DRGs with the highest numbers of discharges are ranked by volume and all other DRGs are summarized:
A brief description of the Medicare Prospective Payment System is provided to explain the system, DRGs, the case mix index, etc.