(a)
Determination by Commissioner pursuant to agreement between Commissioner and State; costs
The Commissioner of Social Security may enter into an agreement with any State which wishes to do so under which the Commissioner will determine eligibility for medical assistance in the case of aged, blind, or disabled individuals under such State’s plan approved under subchapter XIX of this chapter. Any such agreement shall provide for payments by the State, for use by the Commissioner of Social Security in carrying out the agreement, of an amount equal to one-half of the cost of carrying out the agreement, but in computing such cost with respect to individuals eligible for benefits under this subchapter, the Commissioner of Social Security shall include only those costs which are additional to the costs incurred in carrying out this subchapter.
(c)
Loss of benefits upon entitlement to child’s insurance benefits based on disability
If any individual who has attained the age of 18 and is receiving benefits under this subchapter on the basis of blindness or a disability which began before he or she attained the age of 22—
(1)
becomes entitled, on or after the effective date of this subsection, to child’s insurance benefits which are payable under section
402
(d) of this title on the basis of such disability or to an increase in the amount of the child’s insurance benefits which are so payable, and
(2)
ceases to be eligible for benefits under this subchapter because of such child’s insurance benefits or because of the increase in such child’s insurance benefits,
such individual shall be treated for purposes of subchapter XIX of this chapter as receiving benefits under this subchapter so long as he or she would be eligible for benefits under this subchapter in the absence of such child’s insurance benefits or such increase.