We use the criteria in the Listing of Impairments (the Listings) to evaluate claims under the Social Security and Supplemental Security Income (SSI) programs. This final rule extends until July 2, 2003, the date on which the respiratory system listings will no longer be effective. We have made no revisions to the medical criteria in these listings; they remain the same as they now appear in the Code of Federal Regulations. This extension will ensure that we continue to apply these criteria when you file for benefits based on disability under title II and title XVI of the Social Security Act (the Act).