Table 3. Performance Measures of Organism-Specific ICD-9 Pneumonia Diagnosis Codes for Identifying Organism-Positive Laboratory Findings.
| Organism | ICD-9 code | ICD-9 performance vs laboratory criterion standard, %a | |||
|---|---|---|---|---|---|
| Test performance | Predictive value | ||||
| Sensitivity | Specificity | Positive | Negative | ||
| MSSA | 482.41 | 14.2 | 99.9 | 91.1 | 95.4 |
| MRSA | 482.42 | 49.3 | 99.4 | 76.0 | 98.1 |
| Streptococcus pneumoniae | 481, 482.30 | 60.1 | 99.2 | 73.4 | 98.5 |
| Pseudomonas spp | 482.1 | 46.9 | 99.7 | 80.3 | 98.5 |
| Escherichia coli | 482.82 | 17.3 | 100 | 88.7 | 98.4 |
| Klebsiella pneumoniae | 482 | 35.7 | 99.9 | 79.1 | 99.1 |
| Haemophilus influenzae | 482.2 | 42.8 | 99.9 | 84.7 | 99.4 |
| Mycoplasma pneumoniae | 483 | 53.5 | 99.8 | 61.8 | 99.7 |
| Legionella spp | 482.84 | 78.4 | 99.9 | 82.5 | 99.9 |
| Influenza virus | 487.x, 488.x | 95.9 | 98.9 | 70.8 | 99.9 |
| Respiratory syncytial virus | 480.1 | 24.1 | 100 | 67.2 | 99.9 |
| Parainfluenza virus | 480.2 | 14.0 | 100 | 57.1 | 99.9 |
Abbreviations: ICD-9, International Classification of Diseases, Ninth Revision; MRSA, methicillin-resistant Staphylococcus aureus; MSSA, methicillin-sensitive Staphylococcus aureus; spp several species.
a
Microbiological data (test results for blood or respiratory culture, urinary antigen, or polymerase chain reaction) are considered as the criterion standard.