Alam et al. reported a statistically significant difference of unplanned transfers back to the primary acute care service of 21% of cancer IRF patients versus 9.7% of non-cancer matched controls. Other studies have reported return to the primary acute care service rates of general cancer IRF patients between 16.5 and 35%. In most cases, an uninterrupted acute inpatient rehabilitation course with discharge home is considered a successful IRF admission. The higher frequency of medical complications causing return to the primary acute care service can be problematic. This has spurred research in exploring predictors of return to the primary acute care service events.