20. a. A health insurer which offers a group health plan shall provide a written certification of creditable coverage at the time an individual ceases coverage or otherwise becomes covered under a COBRA continuation provision; at the time an individual ceases to be covered under a COBRA continuation provision; and upon request, on behalf of an individual not later than 24 months after the cessation of coverage under the plan or a COBRA continuation provision.
b. The written certification of creditable coverage shall include the period of creditable coverage of the individual under the group health plan and the coverage under any COBRA continuation provision and any waiting or affiliation period imposed with respect to the individual for coverage under the plan.