Cal. Gov. Code § 31693
In any county, district, or county retirement system providing benefits under this article, the county, district, or county retirement system shall provide any recognized retiree organization, as defined in Section 31471.5, that is recognized by the retirement system of the county or district as representing the retired employees of that county or district reasonable advance notice of any proposed changes in employee health care benefits affecting those retired employees and the organization shall have a reasonable opportunity to comment prior to any formal action by the county, district, or county retirement system on the proposed changes. As used in this section, "proposed changes" means significant changes affecting health care benefits, including, but not limited to, changes in health care carriers, plan design, and premiums.
Ca. Gov. Code § 31693