California Code, Welfare and Institutions Code - WIC § 14005.9

(a) The spend down amount of excess income necessary to become eligible for Medi-Cal shall be determined on a monthly basis.  No person or family shall be required to incur more than one month's spend down amount of excess income to become eligible for Medi-Cal prior to being certified as specified in Section 14018.

(b) Once the beneficiary has incurred expenses for Medicare and other health insurance deductibles or coinsurance charges and necessary medical and remedial services that are not subject to payment by a third party and that equal or exceed their spend down of excess income to become eligible for Medi-Cal, the individual is entitled to receive health care services pursuant to Section 14005 if all other applicable conditions of eligibility under this chapter are met.