(b) Prior to implementing any changes authorized under sections 22 or 23, the appropriate public authority shall evaluate its health insurance coverage and determine the savings that may be realized after the first 12 months of implementation of plan design changes or upon transfer of its subscribers to the commission. The appropriate public authority shall then notify its insurance advisory committee, or such committee's regional or district equivalent, of the estimated savings and provide any reports or other documentation with respect to the determination of estimated savings as requested by the insurance advisory committee. After discussion with the insurance advisory committee as to the estimated savings, the appropriate public authority shall give notice to each of its collective bargaining units to which the authority provides health insurance benefits and a retiree representative, hereafter called the public employee committee, of its intention to enter into negotiations to implement changes to health insurance benefits provided by the appropriate public authority. The retiree representative shall be designated by the Retired State, County and Municipal Employees Association. A political subdivision which has previously established a public employee committee under section 19 may implement changes to its health insurance benefits pursuant to this section and sections 22 and 23. Notice to the collective bargaining units and retirees shall be provided in the same manner as prescribed in section 19. The notice shall detail the proposed changes, the appropriate public authority's analysis and estimate of its anticipated savings from such changes and a proposal to mitigate, moderate or cap the impact of these changes for subscribers, including retirees, low-income subscribers and subscribers with high out-of-pocket health care costs, who would otherwise be disproportionately affected.