; (2) incentive payments for participation in eligible alternative payment models under section 1833(z) of such Act ( 42 U.S.C. 1395l(z) ); (3) the shared savings program under section 1899 of such Act ( 42 U.S.C. 1395jjj ); (4) models under section 1115A of such Act ( 42 U.S.C. 1315a ); and (5) such other payment systems or models as the Secretary may specify.