Pneumonia

Organism of interest1	Any organism
Case	Case
ICD-9-CM coding for pneumonia (includes all bacterial PNU codes) AND positive respiratory culture with an organism of interest	ICD-9-CM coding for pneumonia (includes all PNU codes) AND positive respiratory culture with any organism
Control	Control
No ICD-9-CM code for pneumonia AND No respiratory culture performed or a negative respiratory culture	No ICD-9-CM code for pneumonia AND No respiratory culture performed or a negative respiratory culture
Noncase, noncontrol	Noncase, noncontrol
ICD-9-CM code for pneumonia and positive respiratory culture for an organism NOT of interest OR ICD-9-CM code for pneumonia and no positive respiratory culture performed or negative respiratory culture OR No ICD-9-CM code for bacterial pneumonia + positive respiratory culture for any organism OR No ICD-9-CM code for bacterial pneumonia + positive urine streptococcal antigen	ICD-9-CM code for pneumonia and no positive respiratory culture performed OR negative respiratory culture OR No ICD-9-CM code for pneumonia + positive respiratory culture for any organism OR No ICD-9-CM code for pneumonia +Positive urine streptococcal antigen

Notes:

¹Organisms of interest are Staphylococcus aureus, Klebsiella pneumoniae, Enterococcus faecalis, Enterococcus faecium, Pseudomonas aeruginosa, Acinetobacter baumannii, Streptococcus pneumoniae.

²A common skin contaminant must be cultured from two or more blood cultures drawn on separate occasions within 2 days of each other to count as positive culture. Common skin contaminants in blood culture include diphtheroids (Corynebacterium spp.), Bacillus (not B. anthracis) spp., Propionibacterium spp., coagulase-negative staphylococci (including S. epidermidis), viridans group streptococci, Aerococcus spp., Micrococcus spp.).

³NHSN, National Healthcare Safety Network.