Immigrant Children's Health Improvement Act of 1999

Immigrant Children's Health Improvement Act of 1999 - Amends the Personal Responsibility and Work Opportunity Reconciliation Act of 1996 with respect to lawful resident aliens and their eligibility for Medicaid (title XIX of the Social Security Act (SSA)) and other types of Federal assistance.

Provides States with the option of extending Medicaid-eligibility to certain lawful resident alien pregnant women and children, as well as the option of extending SSA title XXI (Children's Health Insurance) eligibility to such children.

Amends the Immigration and Nationality Act to authorize a State to waive affidavit of support requirements for benefits provided through such State options.