Disclose Preferred Vendors for California Workers' Compensation

Why Disclosure Matters in California Workers' Compensation

California is one of a handful of states that imposes a statutory duty on employers to disclose preferred medical and pharmacy vendors. Under Labor Code § 4600, an employer who has established a preferred provider program must inform injured workers of their rights and the list of designated vendors before treatment begins. Failure to disclose can trigger penalties, delay authorization, and expose the employer to extra exposure in a claim. The rule exists to prevent steering and to give workers a genuine choice among qualified providers.

When the Disclosure Obligation Applies

The duty to disclose preferred vendors arises in two main scenarios. First, when an employer operates a certified preferred provider organization (PPO) or a similar network. Second, when an employer maintains a list of preferred pharmacies, medical clinics, or treatment facilities that it directs workers toward. The obligation kicks in as soon as the employer knows an injury has occurred and the worker is seeking or will seek medical care. If the employer has no such program, no disclosure is required, but the employer must still allow the worker to choose their own treating physician from the appropriate panel.

What Must Be Disclosed

A proper disclosure in California typically includes the name and location of each preferred vendor, the scope of services covered, and a clear statement that the worker is free to choose a non-preferred provider. Employers must provide this information in writing, and many carriers and third-party administrators use a standard form or letter that accompanies the initial claim paperwork. The disclosure should be easy to understand, not buried in dense policy language, and offered in the worker's primary language when feasible.

Penalties for Non-Compliance

California regulators and courts take non-disclosure seriously. An employer who fails to disclose preferred vendors may face:

• A penalty of up to $100 per day for each violation under Labor Code § 4600.1.
• Reimbursement of the worker's reasonable and necessary medical expenses if the non-disclosure caused the worker to receive treatment from a more costly provider.
• Increased scrutiny from the Workers' Compensation Appeals Board (WCAB) and potential disputes over medical billing.
• Reputational risk with injured workers and their attorneys, which can lead to more litigation.

Best Practices for Employers

To stay compliant, employers should maintain an up-to-date vendor list, review it at least annually, and integrate the disclosure into the post-injury reporting workflow. Training for HR staff and supervisors should cover when and how to provide the disclosure, and carriers or third-party administrators should be aligned on the process. Keeping a record of when and how the disclosure was delivered — whether by email, certified mail, or in person — helps defend against any later challenge. Workers who believe they were not properly informed should document the dates and any communications they received.