Qualified medicare beneficiaries are medicare-eligible individuals with income and resources at a level which qualifies them as eligible under section 301 of Title III of the federal "Medicare Catastrophic Coverage Act of 1988", as amended, or subsequent amending federal legislation. For purposes of this article and articles 4 and 6 of this title, such individuals shall be referred to as "qualified medicare beneficiaries". The state department is hereby designated as the single state agency to administer benefits available to qualified medicare beneficiaries in accordance with Title XIX and this article and articles 4 and 6 of this title. Such benefits are limited to medicare cost-sharing expenses as determined by the federal government. Accordingly, the state department shall not be required to provide qualified medicare beneficiaries the entire range of services set forth in section 25.5-5-102.