What Is California Labor Code §5307.27: Building the MTUS?

The administrative director, in consultation with the Commission on Health and Safety and Workers' Compensation, shall adopt, after public hearings, a medical treatment utilization schedule, that shall incorporate the evidence-based, peer-reviewed, nationally recognized standards of care recommended by the commission pursuant to Section 77.5, and that shall address, at a minimum, the frequency, duration, intensity, and appropriateness of all treatment procedures and modalities commonly performed in workers' compensation cases.

What Is Labor Code 5307.27?

Section 5307.27 is the law that orders the state to write and keep updating the MTUS, the medical guide workers' comp uses.

Labor Code 5307.27 does not pay a claim, and it does not decide your case. It builds the tool that other rules lean on. The law tells the administrative director to adopt a Medical Treatment Utilization Schedule. That schedule must rest on evidence based, peer reviewed, medical standards that doctors across the country already recognize. Once adopted, it applies to every claim where a doctor asks for care.

The duty to pay for that care comes from a different law, Labor Code section 4600, which ties "reasonably required" medical care to these guidelines. The two sections work as a pair. One pays. The other sets the yardstick.

How does the administrative director actually build the MTUS?

The director works with a state commission, opens a public comment period, and holds a hearing before a guideline takes effect.

Section 5307.27(a) names the players and the standard. The administrative director works with the Commission on Health and Safety and Workers' Compensation. Any guideline has to incorporate evidence based, peer reviewed, nationally recognized standards of care. At a minimum, it must cover how often, how long, and how intense treatment should be, and whether a procedure fits the injury at all.

Updates move faster than most state rules. The law exempts MTUS updates from two other sections, 5307.3 and 5307.4, and from the formal rulemaking steps in the state's Administrative Procedure Act. The public still gets a say. The director must open at least a 30 day comment period, hold a public hearing, and answer the comments received before the order takes effect. Every finished order has to be posted on DWC's own website.

This is not a one time event. In September 2026, DWC posted a notice proposing a new knee disorders guideline, built from a medical society update published that July, and set a comment deadline and hearing date before adopting it. That notice described itself as following this law's comment and hearing steps. It is the clearest recent example of how section 5307.27 works in practice.

What must the guidelines cover, and who writes them?

The MTUS leans on outside medical society guidelines, mostly from ACOEM, adopted through dated administrative director orders.

DWC has adopted most MTUS treatment guidelines from the American College of Occupational and Environmental Medicine, usually shortened to ACOEM. It treats these guidelines as the core of the MTUS, because Labor Code 4604.5 makes them presumptively correct on how much treatment a condition needs. Each guideline reaches the MTUS through formal rulemaking or through a dated administrative director order.

DWC updates topics on its own schedule, not all at once. Shoulder disorders and elbow disorders both carry orders effective January 2, 2026. Other topics carry earlier dates. A worker or doctor should check the current, dated guideline for the condition at issue, not an older version. The regulations sit in title 8 of the California Code of Regulations, sections 9792.20 through 9792.27.23.

Does section 5307.27 include a prescription drug list?

Yes. Since July 2017 the MTUS has carried its own evidence based drug formulary.

Subdivision (b) required the administrative director to add a drug formulary to the MTUS on or before July 1, 2017, built on evidence based medicine. Subdivision (c) phased that formulary in for workers hurt before that date, so a transition rule protects a worker already mid treatment. Subdivision (d) makes the formulary rule apply to every prescriber and every dispenser serving an injured worker in the system, not only a treating physician.

The formulary does not end a doctor's judgment completely. Section 5307.27(b) says nothing in the drug formulary rule blocks a medication that is not on the list once a variance is shown under Labor Code 4604.5(a), the same preponderance of scientific evidence test the MTUS uses for other treatment. See the firm's guide to Labor Code 4604.5 for how that rebuttal standard works.

How does 5307.27 connect to the rest of a treatment dispute?

Section 5307.27 builds the medical ruler. Other sections decide how that ruler gets used on your own claim.

Several related cards explain the sections that actually apply the MTUS to a real dispute. Labor Code 4600 and the MTUS covers the basic duty to pay for care that fits the schedule. Labor Code 4604.5 makes the finished guidelines presumptively correct and caps three kinds of therapy visits. Labor Code 4610, Utilization Review is the claims administrator's own review of a treatment request against the MTUS. Labor Code 4610.5, Independent Medical Review is the usual appeal from a timely UR denial. A different "5307" section, Labor Code 5307.1, sets what a provider gets paid for approved care. It does not decide whether the care was medically necessary in the first place.

Put together, this law answers one narrow question: who writes the medical rulebook, and how. The other sections answer what the rulebook is worth in a dispute, who reviews a specific request, and who gets paid once care is approved.

What should a worker ask about when a decision cites the MTUS?

Ask which guideline the decision used, and ask your doctor to connect your diagnosis to that specific guideline.

A utilization review or independent medical review decision that leans on the MTUS should name the guideline it used. Ask for that guideline by name and effective date. Ask your treating doctor to explain, in writing, how your diagnosis, exam findings, and prior care connect to that same guideline. If a prescribed drug is outside the formulary, ask whether the record supports a variance under Labor Code 4604.5. See the California workers' compensation claim process guide for where a treatment dispute like this fits inside a full claim.

Next steps after a decision cites the MTUS

Save the Request for Authorization, the decision itself, and proof of when it was served. A decision that skips the specific guideline can still be challenged. Contact Yazdchi Law P.C., or call (661) 273-1780, to talk about a California work injury treatment dispute, or use the contact form. The firm reviews each matter individually.