California Code, Family Code - FAM § 6926

(a) A minor who is 12 years of age or older and who may have come into contact with an infectious, contagious, or communicable disease may consent to medical care related to the diagnosis or treatment of the disease, if the disease or condition is one that is required by law or regulation adopted pursuant to law to be reported to the local health officer, or is a related sexually transmitted disease, as may be determined by the State Public Health Officer.

(b) A minor who is 12 years of age or older may consent to medical care related to the prevention of a sexually transmitted disease.

(c) The minor's parents or guardian are not liable for payment for medical care provided pursuant to this section.