For purposes of this subpart, the following definitions apply:
SMI premium surcharge means the amount that the standard monthly SMI premium is increased for late enrollment or for reenrollment as specified in §§ 408.22 through 408.25 .
SMI premium surcharge agreement means a written arrangement between the Secretary and a State or local government agency to pay, on a quarterly, monthly, or other periodic basis, a lump sum for the SMI premium surcharge amounts due for a designated group of eligible enrollees.
42 C.F.R. §408.201