If the Commissioner of Social Security, on the basis of information obtained by or submitted to the Commissioner, believes that an individual entitled to benefits under section
423 of this title, or that a child who has attained the age of eighteen and is entitled to benefits under section
402
(d) of this title, or that a widow or surviving divorced wife who has not attained age 60 and is entitled to benefits under section
402
(e) of this title, or that a widower or surviving divorced husband who has not attained age 60 and is entitled to benefits under section
402
(f) of this title, may have ceased to be under a disability, the Commissioner of Social Security may suspend the payment of benefits under such section
402
(d),
402
(e),
402
(f), or
423 of this title until it is determined (as provided in section
421 of this title) whether or not such individual’s disability has ceased or until the Commissioner of Social Security believes that such disability has not ceased. In the case of any individual whose disability is subject to determination under an agreement with a State under section
421
(b) of this title, the Commissioner of Social Security shall promptly notify the appropriate State of the Commissioner’s action under this subsection and shall request a prompt determination of whether such individual’s disability has ceased. For purposes of this subsection, the term “disability” has the meaning assigned to such term in section
423
(d) of this title. Whenever the benefits of an individual entitled to a disability insurance benefit are suspended for any month, the benefits of any individual entitled thereto under subsection (b), (c), or (d) of section
402 of this title, on the basis of the wages and self-employment income of such individual, shall be suspended for such month. The first sentence of this subsection shall not apply to any child entitled to benefits under section
402
(d) of this title, if he has attained the age of 18 but has not attained the age of 22, for any month during which he is a full-time student (as defined and determined under section
402
(d) of this title).