California Code, Welfare and Institutions Code - WIC § 14103

(1) If the federal medical assistance percentage payable to the state under the ACA for the optional expansion of Medi-Cal benefits to adults is reduced below 90 percent, that reduction shall be addressed in a timely manner through the annual state budget or legislative process. Upon receiving notification of any reduction in federal assistance pursuant to this paragraph, the Director of Finance shall immediately notify the Chairpersons of the Senate and Assembly Health Committees and the Chairperson of the Joint Legislative Budget Committee.

(2) If, prior to January 1, 2018, the federal medical assistance percentage payable to the state under the ACA for the optional expansion of Medi-Cal benefits to adults is reduced to 70 percent or less, the implementation of any provision in this chapter authorizing the optional expansion of Medi-Cal benefits to adults shall cease 12 months after the effective date of the federal law or other action reducing the federal medical assistance percentage.