Centers for Medicare and Medicaid Services is the federal agency, administering the Medicaid program and State Children's Health Insurance Program (CHIP). U.S. Citizenship and Immigration Services explains that applying for free health insurance will NOT affect the child's or family's immigration status. Call their national customer service hotline center at 1-800-375-5283 for more details. Insure Kids Now has state-specific eligibility and application information, a national toll-free hotline, and other resources.