California Code, Probate Code - PROB § 9050

(a) Subject to Section 9054, the personal representative shall give notice of administration of the estate to the known or reasonably ascertainable creditors of the decedent. The notice shall be given as provided in Section 1215. For the purpose of this subdivision, a personal representative has knowledge of a creditor of the decedent if the personal representative is aware that the creditor has demanded payment from the decedent or the estate.

(b) The giving of notice under this chapter is in addition to the publication of the notice under Section 8120.