Emergency Department (ED) Disability Diagnostic Tool

Aim 1: To develop and validate an Emergency Department(ED) Rasch Disability Diagnostic Tool (RDDT). Hypothesis: * Rasch modeling will provide an instrument with better measurement properties, including increased reliability and validity compared to currently available ED measure of disability (MOD). Aim 2: To conduct a randomized controlled trial to evaluate the utility of the ED-RDDT to reduce rehospitalizations in Medicare recipients visiting an urban Emergency Department for non-traumatic illness Hypotheses: * Compared to the standard screening tool, the ED RDDT will reduce reutilization of the hospital (ED visits, hospital admissions, or death) within 60 days of discharge. * The ED RDDT will reduce costs to Medicare, hospitals and patients.