Under California’s Health Care Decisions Law (Prob. Code, § 4600 et seq.), a principal may appoint a health care agent to make health care decisions when the principal later lacks capacity to make them.  This decision holds that the agent’s authority does not extend to signing an arbitration agreement for the principal, at least when the arbitration agreement is a separate document from the patient admission agreement, is optional and has no bearing on whether the principal could access the facility or receive care.  A standard health care agent is empowered only to make decisions relating to health care and disposition of the principal’s body.  The health care agent’s authority does not extend to signing optional arbitration agreements.