Gov. Code, § 31699.9

(a) Expenses of administration of this article shall be allocated by the retirement system board, in its discretion and on a reasonable basis, among the postemployment health benefits fund, the retirement system, and the accounts of the public agencies and trust funds that participate in the postemployment health benefits fund.

(b) The establishment of the postemployment health benefits fund will enable the sharing of expenses of administration and investment, bringing economies of scale and better use of investment expertise to the retirement system. Consequently, the retirement system board may pay the startup and initial administrative expenses for the fund if the retirement system board determines that this expenditure is in the long-term best interests of the members and beneficiaries of the retirement system, and the employers that participate in that system. The board may also assess participating agencies and trusts for all or a portion of those expenses.