The toll free phone number for Medicaid headquarters is 877-267-2323 as of January 2015. The office is located in Baltimore and local residents can use 410-786-3000 instead. TTY users can call toll free at 866-226-1819 and locally at 410-786-0727.
Medicaid also has an office in Washington, D.C. in addition to 10 regional offices in the following cities: Boston, New York, Philadelphia, Atlanta, Chicago, Dallas, Denver, San Francisco, Kansas City, Mo. and Seattle. The toll free number for New York state is 800-342-3334 and for Illinois it is 800-843-6154.
The regional offices oversee the state programs and help them administer Medicaid and Children's Health Insurance Programs.