We are extending the expiration dates of the following body systems in the Listing of Impairments (listings) in our regulations: Musculoskeletal System, Cardiovascular System, Digestive System, and Skin Disorders. We are making no other revisions to these body systems in this final rule. This extension ensures that we will continue to have the criteria we need to evaluate impairments in the affected body systems at step three of the sequential evaluation processes for initial claims and continuing disability reviews.