C.R.S. § 8-13.3-514

(1) An employee of a local government that has declined participation in the program pursuant to section 8-13.3-522 or a self-employed person, including an independent contractor, sole proprietor, partner or joint venturer, may elect coverage under this part 5 for an initial period of not less than three years. The self-employed person or employee of a local government must file a notice of election in writing with the director, as required by the division. The election becomes effective on the date of filing the notice. As a condition of election, the self-employed person or employee of a local government must agree to supply any information concerning income that the division deems necessary. (2) A self-employed person or an employee of a local government who has elected coverage may withdraw from coverage within 30 days after the end of the three-year period of coverage, or at such other times as the director may prescribe by rule, by filing written notice with the director, such withdrawal to take effect not sooner than 30 days after filing the notice.