In general— Not later than January 1, 2020, the Medicaid and CHIP Payment and Access Commission established under section 1900 of the Social Security Act (
42 U.S.C. 1396) shall conduct an exploratory study, using data from a representative sample of States, and submit to Congress a report on at least the following information, with respect to services furnished to individuals enrolled under State plans under the Medicaid program under title XIX of such Act (
42 U.S.C. 1396 et seq.) (or waivers of such plans) who are patients in institutions for mental diseases and for which payment is made through fee-for-service or managed care arrangements under such State plans (or waivers):