Except as provided in section 1383(j) of this title , any individual who was determined to be an eligible individual (or eligible spouse) by reason of being under a disability and was eligible to receive benefits under section 1382 of this title (or a federally administered State supplementary payment) for a month and whose earnings in a subsequent month exceed the amount designated by the Commissioner of Social Security ordinarily to represent substantial gainful activity shall qualify for a monthly benefit under this subsection for such subsequent month (which shall be in lieu of any benefit under section 1382 of this title ) equal to an amount determined under section 1382(b)(1) of this title (or, in the case of an individual who has an eligible spouse, under section 1382(b)(2) of this title ), and for purposes of subchapter XIX shall be considered to be receiving supplemental security income benefits under this subchapter, for so long as—

(A) such individual continues to have the disabling physical or mental impairment on the basis of which such individual was found to be under a disability; and

(B) the income of such individual, other than income excluded pursuant to section 1382a(b) of this title , is not equal to or in excess of the amount which would cause him to be ineligible for payments under section 1382 of this title and such individual meets all other non-disability-related requirements for eligibility for benefits under this subchapter.