Health insurance carriers must submit all rate changes to the Colorado Department of Insurance (DOI) for review and approval before the rates can be applied to consumers. In the spring, insurance carriers file proposals with the DOI to offer health insurance plans in different regions of the sate on the individual and small group markets for the following calendar year. The DOI reviews the rates and publishes the final approval rates in the fall. The rates and filings are made public and can be found on the DOI’s website. The rate filing must include an actuarial memorandum demonstrating the calculation and analysis used to determine the rates submitted.