California Workers’ Comp: 2026 Law Changes You Need to

The California labor law and workers’ compensation system is constantly in flux, and if you’re not paying attention to the court rulings and legislative changes, you’re going to get burned. It doesn’t matter if you’re an injured employee or an employer managing claims. The latest workers’ comp updates are creating new battlegrounds for both sides, especially when it comes to getting medical treatment approved and dealing with presumptions of injury. What does this all actually mean for a real-world claim?

Assembly Bill 2927: Expanded Presumptions for Communicable Diseases

Get ready, because Assembly Bill 2927 is going to be a big deal when it takes effect on January 1, 2026. This law fundamentally changes the game for rebuttable presumptions by expanding them to cover more communicable diseases under California Labor Code Section 3212.87. It applies to a much wider group of healthcare workers, first responders, and other essential employees who get sick during a declared public health emergency. In the past, the worker had to prove a direct link between their job and the illness. Now, if an eligible employee gets a disease like influenza during a public health crisis, the law just assumes it’s work-related. The burden of proof just flipped entirely, and it’s now up to the employer to prove the illness came from somewhere else. For companies with lots of people in these sectors, this changes everything.

For instance, a nurse working at Kaiser Permanente in Oakland who gets a novel respiratory virus during a state-declared emergency will automatically get the benefit of this presumption. To fight that, the employer will have to conduct a serious investigation, probably involving contact tracing and hard evidence of exposure outside of work. The California Department of Industrial Relations (DIR) says it will release more guidance on what diseases are covered and how the emergency declarations trigger the law. In my experience, these presumption cases are incredibly difficult to beat without clear, documented proof to the contrary. Employers should be thinking now about what they can do, like improving workplace safety protocols and keeping strong records of employee activities (both on and off the clock) to build a potential defense.

WCAB Clarifies Medical Necessity Challenges

The Workers’ Compensation Appeals Board (WCAB) has finally started cracking down on how medical necessity is proven, especially when treatments are denied by utilization review (UR) or independent medical review (IMR). A series of decisions, including the notable case of Rodriguez v. Acme Corp. (WCAB, 2025), makes it clear that a treating physician can’t just scribble “medically necessary” on a form and expect it to fly. The WCAB wants to see specifics: a detailed explanation connecting the treatment directly to the injury, a description of the expected results, and a clear reason why less invasive or alternative options aren’t good enough. This forces everyone to move away from vague claims and toward real, data-driven justifications.

Sure, this puts more of a burden on doctors to write better reports, and they’re already busy. But the goal is to get injured workers the right treatment and give employers a clearer standard to evaluate requests against. I’ve seen countless cases get bogged down in delays and denials simply because a doctor’s report was thin, even when the treatment was obviously right for the patient. The WCAB’s position here just proves how critical solid medical documentation is. Attorneys for injured workers need to be coaching their clients’ doctors to be incredibly thorough, referencing medical guidelines and studies. On the other side, defense attorneys can now use this higher standard to push back on fuzzy treatment plans. The objective is to make sure the care is appropriate and well-supported.

Regulatory Amendments to Medical Treatment Authorization Timelines

The California Division of Workers’ Compensation (DWC) has rolled out major regulatory changes to the timelines for medical treatment authorization requests (TARs) and the whole utilization review (UR) process. These new rules, found in California Code of Regulations, Title 8, Sections 9792.6 and 9792.9.1, are designed to speed up medical care for injured workers. One of the biggest changes is the shortened response time for certain requests. For non-urgent prospective treatment, a UR decision must now be made within five business days, down from seven. Urgent requests still get a 72-hour timeline, but the definition of “urgent” has been tightened up to focus on situations where a delay could seriously impact the patient’s health.

These new deadlines mean everyone has to work faster and smarter. Employers and their claims administrators have to make sure their UR vendors can keep up. If they miss a deadline, the treatment can be automatically authorized, which is an expensive consequence of being slow. From the worker’s point of view, it’s good news, as it should lead to faster care. But it also means that if you’re slow to provide your complete medical information, you can cause an immediate problem in the UR process. My firm is constantly stressing to clients that they need to get all their paperwork in fast to avoid these issues. The DWC wants to cut down the massive backlog of treatment requests and make sure people get care on time.

Hernandez v. Workers’ Compensation Appeals Board: Redefining Serious and Willful Misconduct

Anyone handling a claim involving “serious and willful misconduct” needs to read the appellate court’s decision in Hernandez v. Workers’ Compensation Appeals Board (2025) (citation pending publication). This case, coming out of the California Court of Appeal, Fourth Appellate District, really raises the bar for proving an employer’s actions were bad enough to trigger a 50% increase in benefits under California Labor Code Section 4553. The court tightened the definition of what this misconduct looks like, deciding that just being negligent, or even grossly negligent, isn’t enough. To win one of these claims now, an injured worker must show the employer had a “reckless disregard of the probable consequences” or intentionally ignored a known safety rule that caused the injury. This makes proving these enhanced penalty claims much, much harder.

The case itself involved a worker injured on a machine with a known defect. The employer argued it wasn’t aware of the specific danger that caused the accident, and the court bought it. While the employer may have been sloppy with its maintenance, the court found no evidence of a conscious decision to ignore a safety rule or a deliberate indifference to the worker’s well-being. This ruling will almost certainly lead to fewer successful serious and willful misconduct claims, which is a win for employers. For injured workers, it means you’ll need a smoking gun, really powerful evidence showing the employer knew about a specific hazard and consciously chose to do nothing. This case is a wake-up call for employers to keep detailed safety records and to document how they address every single hazard that gets reported.

Impact of the State Board of Workers’ Compensation Directives

It’s not just new laws. The State Board of Workers’ Compensation has also been issuing directives to try and unclog the system and get claims resolved earlier. While these aren’t laws, they carry a lot of weight. One directive from March 2025 is pushing for mandatory settlement conferences (MSCs) to happen much earlier in a case’s life, especially for complex claims with multiple body parts or difficult medical questions. The Board’s thinking is that getting a judge involved early can help pinpoint the real issues and push the parties toward a deal before they’ve spent a fortune on litigation. This forces attorneys on both sides to be ready to argue their case and talk settlement numbers much sooner than they might be used to.

The Board is also going after the Qualified Medical Evaluators (QMEs) and the quality of their reports. Another directive stresses that QME reports have to be complete and must clearly state the percentage of disability caused by the work injury versus pre-existing conditions or other non-work factors, per California Labor Code Section 4663. Apportionment has always been a litigation magnet, and the Board is trying to stop these fights by demanding more clarity from the doctors. Honestly, it’s a sensible move. Vague QME reports are a huge reason why litigation drags on. When a report is clear, there’s less to argue about, and that saves everyone time and money. Employers need to make sure the QMEs they use understand that the Board is expecting a much higher level of detail in their reports.

Working through the New Field: Steps for Employers and Employees

With all these new California labor and workers’ comp updates, how should you adjust? For employers, you need to immediately review your safety protocols and claims procedures. This means updating your internal policies for the new communicable disease presumptions, training all your supervisors on the reporting rules, and confirming your utilization review process can meet the DWC’s faster timelines. Running safety audits at your manufacturing facility in Los Angeles or construction site in San Diego is no longer just a “best practice”, it’s a legal shield. And documentation is everything. I can’t stress this enough. Detailed records of safety training, incident investigations, and every communication about an injury can be the one thing that saves you from a costly settlement. Also, with the higher standard for serious and willful misconduct claims, bringing in legal counsel early on is a very smart play.

For employees, knowing about these changes is how you protect your own rights. The single most important thing you can do is report any workplace injury or illness right away. Waiting only weakens your claim. You also have to be very careful to document all your symptoms and medical appointments. When you’re with your treating physician, make sure every symptom related to your injury is written down and that any treatments they request are fully explained in their medical reports. If UR or IMR denies a treatment, you need to get legal advice immediately because there are tight deadlines to appeal. It’s also critical to know your rights under California Labor Code Section 132a, which protects you from being fired or discriminated against for filing a claim. The system is complicated, and you can’t assume your employer is going to explain it all to you. It’s on you to get informed or get help from someone who is.

The world of California workers’ comp law keeps moving, and you have to be vigilant to keep up. These recent updates, from expanded presumptions to stricter standards for medical proof, show that you can’t just sit back. You have to stay informed and be ready to make decisions. Keeping current with these changes is about getting a fair outcome.