Figure 16: Number of hospital separations ICD-10-AM coded as J09, J10 or J11, Australia, 2004-2009, by diagnosis type This figure presents the number of hospital separations ICD-10-AM coded as J09, J10 or J11 for the period 2004 to 2009 by diagnosis type. In comparison to the 2004 to 2008 period, in 2009 there was almost a five-fold increase in the number of separations for virologically confirmed influenza and a three-fold increase for influenza with or without virological confirmation. Additionally the ratio of virologically confirmed influenza to non-virologically confirmed influenza was much higher in 2009 compared to the 2004-2008 mean.