Upon the death after 1967 of an individual entitled to benefits under section 402(a) or section 423 of this title , if any person is entitled to monthly benefits or a lump-sum death payment, on the wages and self-employment income of such individual, the Commissioner of Social Security shall recompute the decedent’s primary insurance amount, but only if the decedent during his lifetime was paid compensation which was treated under section 405( o ) of this title as remuneration for employment.