Cal. Probate Code § 4670 : California Probate Code — Health Care Decisions — Advance Health Care Directives — General Provisions — Giving individual health care instruction Date: 31 Aug 2016 TEXT PDF Current through the 2016 Legislative Session An adult having capacity may give an individual health care instruction. The individual instruction may be oral or written. The individual instruction may be limited to take effect only if a specified condition arises. Ca. Prob. Code § 4670 EFFECTIVE 7/1/2000. Added October 10, 1999 (Bill Number: AB 891) (Chapter 658).