Cal. Code Regs. tit. 22 § 71513
If a hospital does not employ a qualified professional person to render a specific service to be provided by the hospital, there shall be arrangements for such a service through a written agreement with an outside resource which meets the standards and requirements of these regulations. The responsibilities, functions, and objectives, and the terms of agreement, including financial arrangements and charges, of each such outside resource shall be delineated in writing and signed by an authorized representative of the hospital and the person or the agency providing the service. The agreement shall specify that the hospital retains professional and administrative responsibility for the services rendered. The outside resource, when acting as a consultant, shall apprise the administrator of recommendations, plans for implementation and continuing assessment through dated, signed reports which shall be retained by the administrator for follow-up action and evaluation of performance.
Cal. Code Regs. Tit. 22, § 71513