Sec. 4.022. MANDATORY ADJUSTMENTS TO RETIREE HEALTH PLAN CONTRIBUTIONS, OUT-OF-POCKET PAYMENTS, AND DEDUCTIBLES. (a) Subject to Subsection (b) of this section, if on October 1, 2017, the actuary determines and states in the then most recent actuarial report delivered to the board that the number of years required to fully amortize the unfunded liability of the fund is more than 30 years, the board shall modify the retiree health plan as follows:

(1) the amount of the contributions in effect under Sections 4.02 and 4.021 of this Act shall be increased by a percentage determined by the board not to exceed 10 percent on October 1 of each year, commencing October 1, 2017; and

(2) the maximum deductibles and maximum out-of-pocket payments for each individual in a calendar year and for each family in a calendar year set out in the retiree health plan then in effect shall be increased by a percentage determined by the board not to exceed 10 percent on January 1 of each year, commencing January 1, 2018.

(b) The board is not required to implement additional increases under Subsection (a) of this section if the actuary determines and states in the actuarial report delivered to the board under that subsection that the number of years required to fully amortize the unfunded liability of the fund is 30 years or less.

(c) Except as provided by this section, the board may not change the amount of contributions to the fund by a member under Section 4.02 of this Act or a municipality under Section 4.021 of this Act.