Section 4697 Of Article 3. Revocation Of Advance Directives From California Probate Code >> Division 4.7. >> Part 2. >> Chapter 1. >> Article 3.

. (a) If after executing a power of attorney for health care the principal's marriage to the agent is dissolved or annulled, the principal's designation of the former spouse as an agent to make health care decisions for the principal is revoked.
  (b) If the agent's authority is revoked solely by subdivision (a), it is revived by the principal's remarriage to the agent.