Minn. Stat. § 62E.141

No employee of an employer that offers a health plan, under which the employee is eligible for coverage, is eligible to enroll, or continue to be enrolled, in the Comprehensive Health Association, except for enrollment or continued enrollment necessary to cover a condition that is subject to an unexpired preexisting condition limitation, preexisting condition exclusion, or exclusionary rider under the employer's health plan. This section does not apply to persons enrolled in the Comprehensive Health Association as of June 30, 1993. With respect to persons eligible to enroll in the health plan of an employer that has more than 29 current employees, as defined in section 62L.02 , this section does not apply to persons enrolled in the Comprehensive Health Association as of December 31, 1994.