Cal. Welf. & Inst. Code § 14092.25

In areas where a Medi-Cal beneficiary has the opportunity to enroll in a Medi-Cal managed care plan or to enroll with a primary care provider under this article, the director may require a beneficiary who is certified pursuant to subdivision (c) of Section 14016.5 that he or she has an established relationship with a provider, to enroll in a managed care plan, a pilot project, or a primary care provider under this article, if the beneficiary relies on care provided by hospital emergency departments for nonemergency care.