Glossary This list identifies and defines terms SSA, IRS, and state administrators commonly use in administering Section 218. Term Definition 218 Agreement See Section 218 Agreement 218(b)(5)Coverage Group See Absolute Coverage Group 218(d) Coverage Group See Retirement System Coverage Group 69 Number A nine-digit number assigned by SSA prior to 1987 to every State… Continue reading Glossary of SSA, IRS and State Administrators