CHIP Data and Evaluation Improvement Act of 1999 - Amends title XXI (Children's Health Insurance) (CHIP) of the Social Security Act (SSA) to provide for the following: (1) adjustment to the annual Current Population Survey conducted by the Bureau of the Census in order to produce State-by-State annual data on the number of low-income children without health insurance coverage; (2) collection of certain data for providing State-by-State annual information on the health care access and utilization of children in low-income households, among other things; (3) independent Federal evaluation of a limited number of State CHIP plans through the Secretary of Health and Human Services (HHS), with evaluation results to be submitted to Congress; (4) standardized reporting requirements for annual reports to the Secretary; (5) an HHS Inspector General audit and General Accounting Office report to Congress with regard to certain enrollees under State CHIP plans who are eligible for Medicaid; and (6) coordination of data collection under CHIP with data requirements under the Maternal and Child Health Services program under SSA title V.

Directs the Secretary to establish a clearinghouse for the consolidation and coordination of all Federal data bases and reports regarding children's health.

Makes necessary appropriations.