The jurisdiction of the Subcommittee on Social Security shall include bills and matters referred to the Committee on Ways and Means that relate to the Federal Old-Age, Survivors’ and Disability Insurance System, the Railroad Retirement System, and employment taxes and trust fund operations relating to those systems. More specifically, the jurisdiction of the Subcommittee on Social Security shall include bills and matters involving title II of the Social Security Act and Chapter 22 of the Internal Revenue Code (the Railroad Retirement Tax Act), as well as provisions in title VII and title XI of the Act relating to procedure and administration involving the Old-Age, Survivors’ and Disability Insurance System.

Source: "Manual of Rules of the Committee on Ways and Means for the One Hundred Ninth Congress," WMCP: 109-1.