California SB 1160, the workers’ compensation reform signed in 2016 with provisions phasing in through 2018, made four main changes: it exempted most routine medical treatment from utilization review during the first 30 days after a work injury, required lien claimants to file sworn declarations verifying their liens, doubled the annual penalty cap for claims administrators who fail to report data, and created a faster independent medical review track for drug formulary disputes.
The 30-Day Utilization Review Exemption
Before SB 1160, nearly every proposed treatment in a workers’ comp claim had to clear prospective utilization review before an insurer would authorize it. That gate often stalled care during the weeks when early treatment matters most. SB 1160 amended Labor Code Section 4610 to let most treatment proceed without that review during the first 30 days after a work-related injury.1Division of Workers’ Compensation. Senate Bill 1160
Three conditions must line up for the exemption to apply. The treatment has to be consistent with the Medical Treatment Utilization Schedule (MTUS), the state’s evidence-based guideline set. The treating physician has to be part of the employer’s medical provider network, a health care organization, or a doctor the employee predesignated before the injury. And the physician must submit a treatment report plus a complete request for authorization within five days of the first visit.2California Legislative Information. California Labor Code LAB 4610
Care delivered during those 30 days that strays from the MTUS can still be reviewed after the fact. Retrospective review won’t claw back treatment already provided, but it can get the physician removed from treating that worker going forward.
Treatments That Still Need Prior Approval
The 30-day window is not a free pass. Labor Code Section 4610(c) lists treatment categories that still require prospective approval during the first 30 days, unless the employer authorizes them or the care qualifies as an emergency:
- Non-formulary medications. Drugs not authorized by the state’s drug formulary still need advance approval; formulary-compliant prescriptions are exempt.
- Non-emergency surgery, both inpatient and outpatient, including all pre- and post-surgical services.
- Psychological treatment.
- Home health care.
- Advanced imaging such as MRIs and CT scans. Simple x-rays are exempt.
- Durable medical equipment when the combined total value exceeds $250 under the official medical fee schedule.
- Electrodiagnostic testing, including EMGs and nerve conduction studies.
Routine early care like office visits, basic diagnostics, x-rays, and formulary medications moves without insurer pre-approval. The costlier interventions still go through review.2California Legislative Information. California Labor Code LAB 4610
Lien Declarations and the Mass Dismissal
Lien abuse was one of the system’s largest cost drivers before SB 1160. Medical providers and others filed hundreds of thousands of liens for services rendered to injured workers, and many were fraudulent or meritless. SB 1160 amended Labor Code Section 4903.05 to require every lien claimant to file a declaration, under penalty of perjury, verifying that the lien is legitimate and filed only by the actual lienholder or a proper assignee.1Division of Workers’ Compensation. Senate Bill 1160
The consequence for skipping the declaration is automatic. Liens filed without one are dismissed by operation of law. Claimants with liens filed between January 1, 2013 and December 31, 2016 had until July 1, 2017 to file the declarations for those existing liens. Roughly 292,000 liens were automatically dismissed when claimants failed to submit by that deadline.1Division of Workers’ Compensation. Senate Bill 1160 Nearly 300,000 claims evaporated once claimants had to swear to them under oath.
Higher Penalties for Claims Administrators
Every claims administrator must report specified claims data to the Division of Workers’ Compensation under Labor Code Section 138.6. Before SB 1160, the maximum administrative penalty for violating those requirements was $5,000 per year. SB 1160 doubled the cap to $10,000 per year.3California Legislative Information. California Labor Code LAB 138.6
Within that annual cap, the per-violation structure runs as follows. Reports that are not submitted or not accepted draw up to $100 per violation. Reports that are late or contain errors draw up to $50 per violation. Multiple errors in a single report count as one violation, not several.
For repeat offenders, the bill added enhanced penalties. Claims administrators who accumulate more than $8,000 in fines in consecutive years face penalties between $15,000 and $45,000. The administrative director is also required to publicly post the names of non-compliant claims administrators on the Division of Workers’ Compensation website.3California Legislative Information. California Labor Code LAB 138.6 The public listing adds reputational pressure on top of the dollar penalties.
Independent Medical Review Updates
SB 1160 also adjusted the independent medical review (IMR) process that resolves disputes when an injured worker disagrees with a utilization review decision. For disputes involving medications prescribed under the state’s drug formulary, the worker must request IMR within 10 days of receiving the utilization review decision, compared to 30 days for other treatment disputes. The review organization then has five working days to issue a determination on a formulary dispute.
The bill required utilization review organizations to be accredited by an approved body by July 1, 2018, with re-accreditation every three years. The administrative director can require more frequent re-accreditation if circumstances warrant it.
The $10,000 Treatment Rule Is Not From SB 1160
A common misconception is that SB 1160 created the $10,000 medical treatment authorization requirement. It didn’t. That rule comes from Labor Code Section 5402(c), enacted by SB 863 in 2012, four years before SB 1160. Under Section 5402(c), within one working day after an employee files a claim, the employer must authorize all treatment consistent with the MTUS for the alleged injury and continue providing it until the claim is accepted or rejected. During that period, the employer’s medical treatment liability is capped at $10,000.4California Legislative Information. California Labor Code LAB 5402
Section 5402 and SB 1160 operate in related but separate spaces. Section 5402 governs how much treatment an employer must authorize before deciding whether to accept the claim. SB 1160 governs whether that treatment has to clear utilization review. An injured worker benefits from both.
What It Means in Practice
For injured workers, the most tangible benefit is faster access to routine care. Before SB 1160, even a follow-up office visit could stall waiting for approval. Now, if you see a physician within the employer’s medical provider network and the care follows MTUS guidelines, most early treatment proceeds without that bottleneck. The catch: treatment outside the network doesn’t automatically qualify for the 30-day exemption.
For employers and insurers, compliance priorities shifted. Claims administrators face real financial exposure for sloppy data reporting, with penalties that escalate for repeat violations and public identification of non-compliant organizations. The lien declaration requirement cleared a massive backlog of questionable claims, but it also means the liens that survived the deadline carry a sworn verification behind them.
Disputes over which treatments fall within the review exceptions remain the most active source of friction. Whether a particular imaging study counts as a simple x-ray or as advanced imaging, or whether a medication is truly formulary-compliant, can decide whether treatment begins immediately or waits weeks. Physicians who want to avoid delays need to know the MTUS guidelines and the drug formulary well, because non-compliant care in the first 30 days can trigger retrospective review and get them removed from the case.