Colo. Rev. Stat. § 10-18-107
Medicare supplement policies or certificates shall have a notice prominently printed on the first page of the policy or certificate or attached thereto stating in substance that the policyholder or certificate holder shall have the right to return the policy or certificate within thirty days after its delivery and to have any premium refunded if, after examination of the policy or certificate, the policyholder or certificate holder is not satisfied for any reason. Any refund made pursuant to this section shall be paid directly to the policyholder or certificate holder by the insurer in a timely manner. If a policyholder or certificate holder decides to cancel a policy or certificate after the first thirty days of coverage and the policyholder or certificate holder provides the insurer notice of the cancellation at least thirty days before cancellation, the insurer shall refund a prorated amount of any prepaid premiums for such policy or certificate based on the subsequent full months of coverage being canceled.
C.R.S. § 10-18-107
This section is similar to former § 10-18-107 as it existed prior to 1989.