Cal. CCP § 2020.410

(a) A deposition subpoena that commands only the production of business records for copying shall designate the business records to be produced either by specifically describing each individual item or by reasonably particularizing each category of item, and shall specify the form in which any electronically stored information is to be produced, if a particular form is desired.

(b) Notwithstanding subdivision (a), specific information identifiable only to the deponent’s records system, like a policy number or the date when a consumer interacted with the witness, is not required.

(c) A deposition subpoena that commands only the production of business records for copying need not be accompanied by an affidavit or declaration showing good cause for the production of the business records designated in it. It shall be directed to the custodian of those records or another person qualified to certify the records. It shall command compliance in accordance with Section 2020.430 on a date that is no earlier than 20 days after the issuance, or 15 days after the service, of the deposition subpoena, whichever date is later.

(d) If, under Section 1985.3 or 1985.6, the one to whom the deposition subpoena is directed is a witness, and the business records described in the deposition subpoena are personal records pertaining to a consumer, the service of the deposition subpoena shall be accompanied either by a copy of the proof of service of the notice to the consumer described in subdivision (e) of Section 1985.3, or subdivision (b) of Section 1985.6, as applicable, or by the consumer’s written authorization to release personal records described in paragraph (2) of subdivision (c) of Section 1985.3, or paragraph (2) of subdivision (c) of Section 1985.6, as applicable.