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The All Patient Refined DRGs (APR-DRGs) are assigned using software developed by 3M Health Information Systems. This severity measure includes the base APR-DRG, the severity of illness subclass, and the risk of mortality subclass within each base APR-DRG. The prefix "APRDRG" has been included in the data element names to distinguish APR-DRG measures from other HCUP data elements. For more information, please refer to the following documents available on the NIS Documentation CD-ROM and on the HCUP User Support Website (www.hcup-us.ahrq.gov):
Note to analysts: this data element is uniformly coded across states because it is assigned during HCUP processing.
- Overview of Severity Systems
- APR-DRGs V20 Methodology Booklet
For 2010 databases, the APR-DRG version is 28.0. For 2009 databases, the APR-DRG version is 27.0. For 2008 databases, the APR-DRG version is 26.1. For 2007 databases, the APR-DRG version is 25.0. For 2006 HCUP databases, the APR-DRG version is 24. For the 2003-2005 HCUP databases, the APR-DRG version is 20.0 release 1. For the 2002 NIS, the APR-DRG version is 20.0, not release 1.
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