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Table 2 Pneumonia aetiology, based on ICD-9_CM codes

From: Pneumonia burden in elderly patients: a classification algorithm using administrative data

Aetiology HCAP PNP CAP
  n = 2257 n = 6775 n = 17107
  n% n% n%
Bronchopneumonia, organism unspecified 903(40.0) 3482(51.4) 8148(47.6)
Pneumonia, organism unspecified 637(28.2) 1830(27.0) 4901(28.6)
Pneumonia, specified organisms    
Bacterial pneumonia, unspecified 330(14.6) 863(12.7) 2299(13.4)
Pneumonia due to Pseudomonas 82(3.6) 44(0.6) 200(1.2)
Pneumonia due to other specified bacteria 59(2.6) 105(1.6) 247(1.4)
Pneumococcal pneumonia [Streptococcus pneumoniae] 45(2.0) 108(1.6) 289(1.7)
Methicillin-susceptible pneumonia due to Staphylococcus aureus 32(1.4) 16(0.2) 99(0.6)
Pneumonia due to Klebsiella pneumoniae 17(0.7) 26(0.4) 93(0.5)
Pneumonia due to other gram-negative bacteria 15(0.7) 10(0.1) 80(0.5)
Pneumonia due to Staphylococcus, unspecified 15(0.7) 19(0.3) 122(0.7)
Pneumonia due to Escherichia coli [E. coli] 13(0.6) 9(0.1) 54(0.3)
Respiratory conditions due to chemical fumes and vapours 14(0.6) 89(1.3) 23(0.1)
Other 95(4.3) 174(2.6) 552(3.2)