(a) The amount of the subsidy may be readjusted periodically with the concurrence of the adopting parents, which may be specified in the adoption subsidy agreement, depending upon a change in circumstances.
(b) The subsidy may be for special services not covered by any other available resource, which include health or education services. To ensure the services remain appropriate, the services will be reviewed periodically.
(c) The amount of the time-limited or long-term subsidy may in no case exceed that which would be allowable from time to time for the child under foster family care or, in the case of a special service, the reasonable fee for the service rendered.