At the request of the Social Security Administration, the National Academies of Sciences, Engineering, and Medicine's Board on Health Care Services organized a virtual workshop on July 21, 2020, titled The State of the Science of the Use of Biomarkers to Establish the Presence and Severity of Impairments. Workshop discussions focused on the current and potential uses for biomarkers; explored legal and ethical implications associated with biomarker use in clinical decision making; and considered the possible uses of nongenetic biomarkers as tools for the diagnosis or prognosis of the severity of specific physical and mental impairments. This publication summarizes the presentations and discussion of the workshop.