Cal. Welf. & Inst. Code § 14305

The department may limit the scope of health care benefits provided by a prepaid health plan under this chapter to exclude the care of illness or injury which results from or is greatly aggravated by, a catastrophic occurrence, including, but not limited to, an act of war, declared or undeclared, and which occurs subsequent to enrollment in the prepaid health plan. (Repealed and added by Stats. 1974, Ch. 983.)