H.R.2015 - Balanced Budget Act of 1997
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Title IV: Medicare, Medicaid, and Children's Health Provisions - Subtitle A: Medicare+Choice Program - Chapter 1: Medicare+Choice Program - Amends title XVIII (Medicare) of the Social Security Act (SSA) to establish a Medicare+Choice program under which each Medicare+Choice eligible individual (one entitled to benefits under Medicare part A (Hospital Insurance) and enrolled under Medicare part B (Supplementary Medical Insurance)) is entitled to elect, in accordance with certain procedures, to receive Medicare benefits either through the original Medicare fee-for-service program or through a Medicare+Choice plan.
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that was renamed by the criminal Denny Hastert under Shrub -
H.R.1 - Medicare Prescription Drug, Improvement, and Modernization Act of 2003
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Provides for these options to be offered through both: (1) a new Medicare part C Medicare Advantage (MA) program that integrates basic medical coverage with added prescription drug coverage, including coverage through specialized MA plans for special needs individuals; and (2) a new separate, stand-alone Medicare Prescription Drug plan (PDP) program under Medicare part D that relies on private plans to provide coverage and to bear a portion of the financial risk for drug costs.
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I think the original intent was to get some kind of prescription drug benefit for Medicare and the compromise was to also add an option for a non-governmental 3rd party "choice" thing. I.e., an attempt to plant the seeds for privatizing Medicare completely.