Table 2

ICD-9 codes for pulmonary complications and predictor variable

Pulmonary complicationsICD-9 codes
Ventilator support96.7, 96.70, 96.71, 96.72
Respiratory failure518.81, 518.82, 518.84
Pulmonary embolism415.1
Acute respiratory distress syndrome518.5
Ventilator-associated pneumonia997.31
Predictor variable
Obstructive sleep apnea327.2, 327.23, 327.29, 780.51, 780.53, 780.57

  • ICD-9, International Classification of Diseases, Ninth Revision, Clinical Modification.