the Secretary determines appropriate. (ii) Readmission chains For purposes of this subsection, in the case that an individual has multiple readmissions with respect to an initial discharge that, but for the application of this clause, would be considered potentially-avoidable readmissions with respect to such initial discharge, the following shall apply: (I) Only one of such readmission may be considered a potentially-avoidable readmission with respect to such initial discharge. (II) None of such readmissions may be considered a new initial discharge for purposes of this subsection. (C) Potentially-avoidable return emergency room visits The performance category of return emergency room visits (referred to in this section as potentially-avoidable return emergency room visits ) of individuals entitled to benefits under part A to any hospitals following a discharge (referred to in this section as an initial discharge ) of such individuals to an applicable hospital if the initial discharge and return emergency room visit involved would satisfy the requirements described in subclauses (I), (II), (III), (V), (VI), and (VII) if— (i) the references in such subclauses to readmissions instead were references to return emergency room visits