38 U.S.C. § 1979
Incontestability
Subject to the provision of section 1973 of this title , insurance coverage granted under this subchapter shall be incontestable from the date of issue, reinstatement, or conversion except for fraud or nonpayment of premium.
(Added Pub. L. 93–289, § 9(a) , May 24, 1974 , 88 Stat. 172 , § 779; renumbered § 1979 and amended Pub. L. 102–83, § 5(a) , (c)(1), Aug. 6, 1991 , 105 Stat. 406 .)