Part of the Evaluation of Cost of Nosocomial Infections (ECONI) study. Data from the ECONI study were used to estimate the excess length of stay (LOS) associated with HAI. Excess LOS associated with HAI was 7.8 days. Pneumonia (16.3 days) had the greatest impact on LOS, followed by bloodstream infections (11.4 days) and SSI (9.8 days). 58,000 bed days are occupied per year due to HAI.