Healthcare Cost and Utilization Project (HCUP) Statistical Briefs [Internet].
Rockville (MD): Agency for Healthcare Research and Quality (US); 2006 Feb-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
Table 3Average number of secondary diagnosis codes on hospital discharge records, 1993–2012
| Year | Average number of secondary diagnoses per hospital discharge record | Year | Average number of secondary diagnoses per hospital discharge record | |
|---|---|---|---|---|
| 1993 | 2.86 | 2003 | 4.45 | |
| 1994 | 3.14 | 2004 | 4.70 | |
| 1995 | 3.33 | 2005 | 4.98 | |
| 1996 | 3.50 | 2006 | 5.35 | |
| 1997 | 3.59 | 2007 | 5.75 | |
| 1998 | 3.68 | 2008 | 6.34 | |
| 1999 | 3.70 | 2009 | 6.71 | |
| 2000 | 3.77 | 2010 | 7.10 | |
| 2001 | 3.98 | 2011 | 7.76 | |
| 2002 | 4.24 | 2012 | 7.93 |