In Oregon it is common for many patients with TBI not to receive inpatient rehabilitation. The Oregon TBI Model System provides acute care to all patients in its Level 1 Trauma Center, and follows their treatment path and course of recovery regardless of their destination at hospital discharge. Some are discharged into the Model System inpatient rehabilitation program, others into skilled nursing facilities, and others to home without formal or informal rehabilitation. In this study we will compare outcomes from TBI of those people who receive rehabilitation with those who do not. We hypothesize that, controlling for injury severity, payer protocol, and other factors believed to influence recovery, patients with TBI who receive rehabilitation will have better outcomes than those who do not.