Medicaid Redetermination Have you re-enrolled for Medicaid? Learn about changes that could affect your coverage. To keep you covered, or help you find the right coverage for you and your family, here are some resources that may help. Federal Government Resources: Click to find out more from the Federal Government at the Medicaid website. Call the Marketplace Call Center at 1-800-318-2596 to get details about Marketplace coverage. TTY users can call 1-855-889-4325. Colorado-Specific Information and Resources: Colorado Medicaid Health First Colorado Member Contact Center: 800-221-3943