Cal. Bus. & Prof. Code § 4996.14.2
(a) For the purposes of this chapter, the following definitions apply:
(2) “Private practice” means a type of nonexempt setting that meets all of the following criteria:
(b) An active license or registration number shall be required to engage in the practice of clinical social work, as defined in Section 4996.9, in nonexempt settings at all times, except as follows: