Section 6. The amount of group life insurance on each employee shall be five thousand dollars, and the amount of group accidental death and dismemberment insurance on each employee shall be five thousand dollars, except that those employees desiring to elect optional coverage in excess of five thousand dollars group life insurance and five thousand dollars group accidental death and dismemberment insurance may do so as provided in section ten A. The amount of the hospital, surgical, medical, dental and other health insurance benefits to be provided each employee and his dependents shall be determined by the commission as provided under sections four and ten C. As determined by the rules and regulations of the commission, all insurance coverages authorized by this chapter may be considered separable for employee, retiree or deferred retiree application and eligibility purposes.