A deposition subpoena for business records is the workhorse of a personal injury file, and it is also the instrument most likely to blow up in your hands. Serve it wrong and you hand the defense a clean motion to quash. Answer one wrong and you have waived your client's objection to production of a psychiatric chart nobody needed. The mechanics are governed by a handful of Code of Civil Procedure sections that do not read the way plaintiff lawyers use them day to day, and the gap between the statute and the habit is where cases leak.
California runs records subpoenas on two parallel notice tracks depending on whose records you want, layers the Confidentiality of Medical Information Act on top of medical charts, and gives custodians a business-records affidavit procedure that most of them either ignore or misuse. Getting all three right is what separates a file that produces usable records in three weeks from one that produces a redaction dispute in three months.
Two Notice Tracks: Consumer Records and Employee Records
The threshold question is not whether you are subpoenaing a hospital or an employer. It is whether the records are "personal records" of a "consumer" under Code of Civil Procedure section 1985.3, or "employment records" of an "employee" under section 1985.6. Medical records held by a physician, hospital, or health plan fall under 1985.3. Personnel files, payroll, and wage records held by an employer fall under 1985.6. The two sections mirror each other but are not identical, and the practitioner who assumes one governs both will miss a service step.
Both sections require that you give notice to the person whose records are sought before the custodian may produce anything. Under 1985.3, the subpoenaing party must serve the consumer with a copy of the subpoena and a "Notice to Consumer" a set number of days before the production date. Section 1985.6 imposes the parallel obligation for employees. The point of the notice is to give the record subject a window to object or move to quash before the file leaves the custodian's hands. Skip it and the production is defective regardless of how clean the rest of your paperwork is.
This cuts both ways in a PI case. You are the subpoenaing party when you go after a defendant driver's employment and driving records, and you are the record subject's counsel when the defense subpoenas your client's prior treaters. The same statute you rely on to get personnel records is the one the defense must satisfy before touching your client's chart, and a missed Notice to Consumer on their end is your objection to make.
Service Mechanics and Timing
A deposition subpoena for production of business records is served on the custodian, but service alone does not start the clock cleanly unless the notice obligations to the record subject are satisfied first. Under section 1985.3, the consumer must be served with the subpoena and notice, and where that service is by mail the statute adds days to the minimum period. The custodian's production date has to sit far enough out that the record subject's objection window closes before the records are due. Practitioners who calendar only the custodian's date and not the consumer's objection deadline produce the classic defect: records that arrive before the objection period expired.
Section 2020.410 confirms that a business-records-only subpoena cannot command a person to appear and testify; it commands production of documents through the deposition officer. If you want records and testimony, that is a different subpoena. Mixing the two on one form invites a motion to quash the whole thing. Keep the records subpoena clean, and if you need a custodian to authenticate live at trial, handle that separately.
Personal service on the custodian is the safer practice even where mail is permitted, because it removes any argument about receipt and because the added mailing days compress your timeline. On a file where the statute of limitations or a trial date is close, the difference between personal service and mail service on a distant hospital custodian can be the difference between having the chart for your expert's deposition and not. Retrieval speed is an operational problem as much as a legal one; the same discipline that cuts cost and cycle time on records retrieval applies to the subpoena calendar.
Custodian Compliance and the Business Records Affidavit
Evidence Code sections 1560 through 1562 give the custodian a path to comply by mail: produce the records to the deposition officer accompanied by an affidavit of the custodian attesting that the copy is a true copy of records prepared in the ordinary course of business at or near the time of the act or event. Done correctly, that affidavit lays the foundation for the records as a business-records exception to the hearsay rule without dragging the custodian to a deposition. Done incorrectly, it leaves you holding a stack of paper with no foundation.
The common failures are worth cataloguing because you will see all of them. The custodian produces records with no affidavit at all. The affidavit is a photocopied form that does not track the statutory language on ordinary-course preparation and near-contemporaneous recording. The custodian certifies completeness but the Bates range shows a gap, which tells you records were withheld or lost. Or the custodian produces a partial set and says the rest "is not available" without explaining the search. Each of these is a compliance defect you address before the records become evidence, not the week before trial when the defense objects to foundation.
When a custodian's affidavit states that the entity has no responsive records, that is itself a substantive answer worth preserving. A "no records" declaration from a prior employer or a prior treater can matter as much as the records themselves, and it forecloses the later argument that your search was incomplete.
Redaction Disputes and the CMIA
Medical records carry a second statutory layer. The Confidentiality of Medical Information Act, Civil Code section 56 and following, restricts a provider's disclosure of medical information and gives providers a reason — sometimes a pretext — to redact. In litigation, the patient who has placed their physical condition at issue has waived confidentiality as to information relevant to that condition, but the scope of that waiver is contested territory. A provider or a defense firm will read the waiver narrowly when producing your client's favorable records and broadly when seeking unrelated prior treatment.
The recurring fight is the provider who blacks out substance-use, mental-health, or reproductive-health entries citing confidentiality, when those entries bear on causation or damages. The answer is rarely to accept the redactions and rarely to demand the entire unredacted chart. It is to move for in camera review, where the court inspects the redacted material and decides relevance against confidentiality on a document-by-document basis. Frame the motion around the specific entries and the specific issue they touch, not a blanket demand.
The mirror-image problem is defensive. When the defense subpoenas ten years of your client's prior medical records on a soft-tissue case, the over-broad request is your opening to move to quash or for a protective order limiting production to the body parts and time period actually at issue. Placing a knee at issue does not open a client's entire gynecological and psychiatric history, and the court has authority under the discovery statutes to narrow the subpoena to what the pleadings put in controversy.
When the Custodian Stonewalls
Two motions do most of the work. When a custodian refuses to produce, produces late, or produces an incomplete set, the subpoenaing party moves to compel compliance with the deposition subpoena; the motion runs against the non-party custodian and, done right, comes with a request for the reasonable expenses caused by the failure. When a subpoena is over-broad, unduly burdensome, or seeks privileged material, the aggrieved party — the record subject or a party — moves to quash or modify under Code of Civil Procedure section 1987.1, which gives the court broad authority to quash, modify, or condition the subpoena and to award expenses against the party or attorney who acted without substantial justification.
The expense provisions are underused by plaintiff counsel. A hospital that ignores a properly served subpoena for six weeks and then produces an unsigned partial set has imposed real cost on your file, and the statutes contemplate shifting that cost. Documenting the meet-and-confer — the dates, the calls, the emails to the custodian's release-of-information vendor — is what turns a compliance headache into a fee award and, more often, what gets the records produced before you ever file. The same file discipline that keeps case management and lien priority from slipping late in a case keeps subpoena follow-up from slipping early.
Employment records deserve a specific note here. A defendant driver's personnel file, disciplinary history, and driving record can carry a case, as the reversal in Taylor v. B&D Hauling illustrated on the driving-record side. Employers resist producing them harder than hospitals resist medical charts, and they lean on the section 1985.6 employee-notice requirement to slow you down. Serve the notice cleanly, calendar the employee's objection window, and be ready to move to compel the moment the production date passes without a complete response.
The Practical Throughline
Every records subpoena in a California PI file is really three instruments stacked together: a service-and-notice procedure under 1985.3 or 1985.6, a foundation procedure under Evidence Code 1560 through 1562, and, for medical charts, a confidentiality overlay under the CMIA. The lawyers who treat it as one form to fill out are the ones who discover, on the eve of a deposition, that the notice was short, the affidavit was missing, and the redactions were never litigated. Calendar all three deadlines, read every custodian affidavit against the statute, and decide the redaction question the week the records arrive rather than the week you need them.