California Code, Welfare and Institutions Code - WIC § 14111

(a) As permitted by federal law or regulations, for health care services provided in a long-term health care facility that are reimbursed by Medicare, a physician and surgeon may delegate any of the following to a nurse practitioner:

(b) This section does not authorize benefits not otherwise authorized by federal law or regulation.

(c) All responsibilities delegated to a nurse practitioner pursuant to this section shall be performed under the supervision of the physician and surgeon and pursuant to a standardized procedure among the physician and surgeon, nurse practitioner, and facility.

(d) No task that is required by federal law or regulation to be performed personally by a physician may be delegated to a nurse practitioner.

(e) Nothing in this section shall be construed as limiting the authority of a long-term health care facility to hire and employ nurse practitioners so long as that employment is consistent with federal law and within the scope of practice of a nurse practitioner.