DRG Versions

DRGs are released on a fiscal year starting October 1st, so sometimes it is a little tricky to figure out which DRG version you need.

DRGs are assigned to inpatient hospital stays. Normally the DRG would be assigned when the patient is discharged, so the version you need is generally dictated by the discharge date.

Sometimes, for analysis purposes, the discharge date is overridden so an entire data set can be run through the same version DRGs to allow for easier comparisons. This method is not foolproof: medical records coding practices change over time and DRGs are refined so there is a limited window one can use before the DRGs in the older data stop being meaningful.

We started in the DRG game at the beginning, so we have support for DRGs starting with version 2. (Version 1 was experimental, so version 2 is the first version available for general use.)

With version 33 the underlying coding scheme was switched from ICD9cm to ICD10. This was a watershed for DRG software as much of the internals had to change. Usually a new DRG version requires only modification of existing software components but for ICD10 we had to redesign our software and implement it from scratch. In order to mark the distinction, we changed our version numbers from "f{number}" to "v{number}".

Here is the reference we use internally to keep the versions straight:

VersionReleasedRetired VersionReleasedRetired
v33 Oct 1, 2015 Sep 30, 2016 f17 Oct 1, 1999 Sep 30, 2000
f32 Oct 1, 2014 Sep 30, 2015 f16 Oct 1, 1998 Sep 30, 1999
f31 Oct 1, 2013 Sep 30, 2014 f15 Oct 1, 1997 Sep 30, 1998
f30 Oct 1, 2012 Sep 30, 2013 f14 Oct 1, 1996 Sep 30, 1997
f29 Oct 1, 2011 Sep 30, 2012 f13 Oct 1, 1995 Sep 30, 1996
f28 Oct 1, 2010 Sep 30, 2011 f12 Oct 1, 1994 Sep 30, 1995
f27 Oct 1, 2009 Sep 30, 2010 f11 Oct 1, 1993 Sep 30, 1994
f26 Oct 1, 2008 Sep 30, 2009 f10 Oct 1, 1992 Sep 30, 1993
f25 Oct 1, 2007 Sep 30, 2008 f9 Oct 1, 1991 Sep 30, 1992
f24 Oct 1, 2006 Sep 30, 2007 f8 Oct 1, 1990 Sep 30, 1991
f23 Oct 1, 2005 Sep 30, 2006 f7 Oct 1, 1989 Sep 30, 1990
f22 Oct 1, 2004 Sep 30, 2005 f6 Oct 1, 1988 Sep 30, 1989
f21 Oct 1, 2003 Sep 30, 2004 f5 Oct 1, 1987 Sep 30, 1988
f20 Oct 1, 2002 Sep 30, 2003 f4 Oct 1, 1986 Sep 30, 1987
f19 Oct 1, 2001 Sep 30, 2002 f3 Oct 1, 1985 Sep 30, 1986
f18 Oct 1, 2000 Sep 30, 2001 f2 Oct 1, 1984 Sep 30, 1985


The "Retired" column is the date on which the given version is no longer current.

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