employed individual with a medically improved disability

(A) is at least 16 years of age;

(B) is employed (as defined in paragraph (2));

(C) ceases to be eligible for medical assistance under section 1396a(a)(10)(A)(ii)(XV) of this title because the individual, by reason of medical improvement, is determined at the time of a regularly scheduled continuing disability review to no longer be eligible for benefits under section 423(d) or 1382c(a)(3) of this title; and

(D) continues to have a severe medically determinable impairment, as determined under regulations of the Secretary.