§ 420. Disability provisions inapplicable if benefit rights impaired

None of the provisions of this subchapter relating to periods of disability shall apply in any case in which their application would result in the denial of monthly benefits or a lump-sum death payment which would otherwise be payable under this subchapter; nor shall they apply in the case of any monthly benefit or lump-sum death payment under this subchapter if such benefit or payment would be greater without their application.