CFR › Title 42 › Part 423 › §423.90042 CFR §423.900Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Basis. This subpart is based on sections 1935(a) through (d) of the Act as amended by section 103 of the MMA.(b)Scope. This subpart specifies State agency obligations for the Part D prescription drug benefit.