National Commission on Budget Concepts Act of 2002 - Establishes the National Commission on Budget Concepts to, among other things: (1) evaluate structure, concepts, classifications, and bases of accounting of the Federal budget; (2) evaluate the applicability and value of general accounting principles and practices used in the private sector to budget practices in the Federal sector; and (3) report recommendations for modifications to the structure, concepts, classifications, and bases of accounting of the Federal budget that would enhance the usefulness of the budget for public policy and financial planning.