California Code, Welfare and Institutions Code - WIC § 14101.1

The department shall enter into an agreement with the Secretary of Health, Education and Welfare under which such secretary will determine eligibility for Medi-Cal in the case of aged, blind or disabled persons under this state's medical assistance plan approved under Title XIX   1 of the Social Security Act.  The state shall pay the Secretary of Health, Education and Welfare an amount equal to one-half of the cost of carrying out the agreement, but in computing such cost with respect to individuals eligible for benefits under Title XVI   2 of the Social Security Act, such payment shall include only those costs which are additional to the costs incurred in carrying out such title.