; (ii) a MIPS APM (as defined by the Secretary); and (iii) any other alternative payment model that the Secretary may, by regulation, specify. (B) Requirements (i) In general Subject to clause (ii), the requirements described in this subparagraph with respect to an arrangement relating to an alternative payment model are as follows: (I) The arrangement is in writing, identifies the services, items, or actions subject to the arrangement and is signed by the parties to the arrangement. (II) The arrangement includes a description of the alternative payment model. (III) Under the arrangement written reports are submitted to the Secretary on a semi-annual basis on the progress achieved in the development and operation of the alternative payment model. (IV) The arrangement meets such other requirements as the Secretary may impose by regulation as needed to protect against a significant risk of program or patient abuse. (ii) Clarification The Secretary shall not prohibit or restrict an arrangement from meeting the requirements described in this subparagraph on the basis that the arrangement takes into account the volume or value of referrals if such arrangement otherwise meets the requirements described in clause (i). .