Medicare Choice Preservation Act of 2000 - Title I: Improvements in Payments - Amends part C (Medicare+Choice) of title XVIII (Medicare) of the Social Security Act (SSA) to provide for: (1) increasing the national per capita Medicare+Choice growth percentage in 2001 and 2002; (2) increasing the minimum payment amount in 2001 for any of the 50 States and the District of Columbia; (3) allowing a Medicare+Choice organization to elect to apply an area-specific percentage of 50 percent and a national percentage of 50 percent for 2002 rather than the rate currently applicable for that year in determining the blended capitation rate used in determining the calculation of annual Medicare+Choice capitation rates; (4) increasing the minimum percentage increase in 2001 under provisions for calculation of annual Medicare+Choice capitation rates; (5) increasing the update for payment areas with only one or no Medicare+Choice contracts; (6) eliminating the budget neutrality adjustment for 2001 and 2002 under blended capitation rate provisions; (7) revising calculation of area-specific and national percentage capitation rates; and (8) phasing-in over a ten year period of risk adjustment methodology based on data from all settings.

Title II: Additional Improvements - Delays from July to November 2000 the deadline for withdrawing the offer, rescinding the withdrawal, of Medicare+Choice plans for 2001.

Amends SSA title XVIII part C to revise data collection requirements under the Medicare+Choice program with regard to: (1) issuance of encounter data submission; (2) post-stabilization guidelines; (3) effectiveness of elections and changes of elections; (4) uniform premium and benefits; and (5) Medicare+Choice program compatibility with employer or union group health plans.