If the State child health plan provides for benefits through payment for, or a contract with, a group health plan or group health insurance coverage, the plan may permit the imposition of a preexisting condition exclusion but only insofar as it is permitted under the applicable provisions of part 7 of subtitle B of title I of the Employee Retirement Income Security Act of 1974 [
29 U.S.C.
1181 et seq.] and title XXVII of the Public Health Service Act [
42 U.S.C.
300gg et seq.].