United States. Congress, America's Affordable Health Choices Act of 2009…
“ Limitation on cost-sharing for dual eligibles and qualified medicare beneficiaries.—In the case of a individual who is a full-benefit dual eligible individual (as defined in section 1935 (c) (6) ) or a qualified medicare beneficiary (as defined in section 1905 (p) (1) ) who is enrolled in a Medicare Advantage plan, the plan may not impose cost-sharing that exceeds the amount of cost-sharing that would be permitted with respect to the individual under this title and title XIX if the individual were not enrolled with such plan. ”
