Medicare Early Access and Tax Credit Act of 2000 - Title I: Access to Medicare Benefits for Individuals 62-to-65 Years of Age - Amends title XVIII (Medicare) of the Social Security Act (SSA) to add a new part D (Purchase of Medicare Benefits by Certain Individuals Age 62-to-65 Years of Age) under which an enrollee is entitled to the same Medicare benefits as an individual entitled to benefits under Medicare part A (Hospital Insurance) and enrolled under Medicare part B (Supplementary Medical Insurance).

Provides for the determination and payment of monthly premiums under the new part D program.

Creates in the Treasury the Medicare Early Access Trust Fund to hold the premiums paid pursuant to this Act and savings from new fraud and abuse initiatives that are obtained pursuant to the Medicare Fraud and Reimbursement Reform Act of 1999. Provides for oversight and accountability concerning the status of the Trust Fund.

Title II: Access to Medicare Benefits for Displaced Workers 55-to-62 years of Age - Amends SSA title XVIII to provide access to Medicare benefits to displaced workers (and their spouse) 55-to-62 years of age.

Title III: COBRA Protection for Early Retirees - Subtitle A: Amendments to the Employee Retirement Income Security Act of 1974 - Amends the Employee Retirement Income Security Act of 1974 (ERISA) to provide for COBRA (Consolidated Omnibus Budget Reconciliation Act of 1985) continuation benefits for certain retired workers who lose retiree health coverage.

Subtitle B: Amendments to the Public Health Service Act - Amends the Public Health Service Act to provide for COBRA continuation benefits for certain retired workers who lose retiree health coverage.

Subtitle C: Amendments to the Internal Revenue Code of 1986 - Amends the Internal Revenue Code to provide for COBRA continuation benefits for certain retired workers who lose retiree health coverage.

Title IV: Financing - Provides that any increase in Medicare payments resulting from enactment of this Act shall be offset by reductions in Medicare payments pursuant to the anti-fraud and -abuse provisions of the Medicare Fraud and Reimbursement Reform Act of 1999.

Title V: Credit Against Income Tax for Medicare Buy-In Premiums and for Certain COBRA Continuation Coverage Premiums - Amends the Internal Revenue Code to provide an individual with a tax credit for 25 percent of certain COBRA continuation coverage premiums and Medicare buy-in premiums.