Probate Code 2355 (1990, amended 1999)

Summary:

If the conservatee has been adjudicated to lack the capacity to make health care decisions, the conservator has the exclusive authority to make health care decisions for the conservatee that the conservator in good faith based on medical advice determined to be necessary.

Other Relevant California Code Sections: 
Probate Code 1880: permitting a court to adjudge a conservatee incapable of supplying informed consent for medical treatment
Associated Federal Law(s): 
Uses and disclosures of protected health information: general rules : personal representatives - must be treated as the individual with respect to the protected health information