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Colorado Immunization Information System (CIIS) is a confidential, population-based, computerized system that collects and consolidates vaccination data for Coloradans of all ages from a variety of sources. CIIS helps healthcare providers, schools, childcare centers, universities, and individuals keep track of the shots that they and/or their children have received.

CIIS is a program within the Colorado Immunization Section at the Colorado Department of Public Health and Environment (CDPHE). CIIS is a lifelong immunization record tracking system under the Colorado Immunization Registry Act of 2007.

For more information visit the CIIS website here.
https://www.colorado.gov/pacific/cdphe/colorado-immunization-information-system-ciis


To exclude yours or your child's information from CIIS, visit the CIIS opt-out procedures web page to opt out of the registry. You will also find information on how to rescind a prior opt out.
https://www.colorado.gov/pacific/cdphe/ciis-opt-out-procedures