; recalculation If the retired grade of an officer is reduced, the retired pay of the officer under chapter 71 of title 10 shall be recalculated, and any modification of the retired pay of the officer shall go into effect on the effective date of the reduction in retired grade. (d) Finality of retired grade determinations (1) Administrative finality Except as otherwise provided by law, a determination of the retired grade of an officer pursuant to this section is administratively final on the day the officer is retired, and may not be reopened. (2) Reopening determination A determination of the retired grade of an officer may be reopened as follows: (A) If the retirement or retired grade of the officer was procured by fraud. (B) If substantial evidence comes to light after the retirement that could have led to a lower retired grade under this section if known by competent authority at the time of retirement. (C) If a mistake of law or calculation was made in the determination of the retired grade. (D) In the case of a retired grade following a conditional determination under subsection (a)(2) or (b)(2), if the investigation of or personnel action against the officer, as applicable, results in an adverse finding. (E) If the Secretary determines, pursuant to regulations prescribed by the Secretary, that good cause exists to reopen the determination or certification. (3) Notification of reopening If a determination or certification of the retired grade of an officer is reopened, the Secretary— (A) shall notify the officer of the reopening; and (B) may not make an adverse determination on the retired grade of the officer until the officer has had a reasonable opportunity to respond regarding the basis of the reopening. (4) Retired pay