 During Phase I, baseline prevalence and natural history of OH will be determined by: enrolling consecutive appropriate subjects able to stand, not end of life care from a rehabilitation and nursing home unit and measuring OH 3 times weekly over their inpatient stay. In addition, chart review of diagnoses, medications, functional status, nutrition, and adverse events will be evaluated and correlated with clinical status. During Phase II, the investigators will implement a standardized, interdisciplinary MDRNPTDietician treatment plan for patients with OH. This will include chart review of diagnoses, medications, functional status, nutrition, adverse events, and correlation with clinical status. The goals of the interventions are to identify and treat the underlying causes of OH in rehabilitation patients. Based upon the comprehensive assessment, intervention participants will receive a standardized, interdisciplinary treatment regime. 