About Us


Operated by the Colorado Department of Public Health and Environment (CDPHE), the Colorado Immunization Information System (IIS), is a confidential, population-based, computerized system that collects and consolidates vaccination data for Coloradans of all ages from a variety of sources.

Immunization registries provide a single source for immunization records. Information is entered at birth through a linkage with electronic birth records or at first contact with the health care system.

Immunization registries are essential for maintaining high immunization rates. High-risk areas of the community can be identified to prevent or contain disease outbreaks. With record-low disease, registry information is important for reminding parents of the importance of timely immunization.

Provider participation is vital to the success of the IIS. The usefulness of registries is directly proportional to the level of participation by providers and patients. To be fully successful all immunizing entities must actively participate.