CFR›Title 48›Chapter 21›Part 2143 ContainsSubparts 2143.1–2143.2CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 PART 2143—CONTRACT MODIFICATIONS Subparts 2143.1 Subpart 2143.1—General Section 2143.101 2143.2 Subpart 2143.2—Change Orders Section 2143.205 Authority5 U.S.C. 8716; 40 U.S.C. 486(c); 48 CFR 1.301.Source58 FR 40380, July 28, 1993, unless otherwise noted. Previous 2137 Part 2137—Service Contracting Next 2144 Part 2144—Subcontracting Policies and Procedures