California Labor Code 4660.1: Strict Rating Formula for 2013-Onward Injuries

How the 2013-onward formula works

For a post-2012 injury, the rating usually begins with a doctor. The doctor may be the treating doctor, a qualified medical evaluator, or an agreed medical evaluator. The doctor assigns whole person impairment under the AMA Guides Fifth Edition. That WPI number is the medical base. Labor Code 4660.1 then requires the 1.4 factor. The rating schedule next accounts for the worker's job and age. The final percentage is used with the indemnity schedule to set the number of payable weeks.

A rating can turn on small medical details. A missed motion finding can matter. So can a weak diagnosis estimate. The wrong job group can move the number. An unclear apportionment opinion can reduce benefits without a sound basis. The statute seeks consistency. But the inputs still come from medical evidence and rating rules.

What add-on ratings are limited?

Labor Code 4660.1 limits most add-on ratings for sleep dysfunction, sexual dysfunction, and psychiatric disorder. This limit applies when those conditions arise from a compensable physical injury. In many post-2012 cases, those conditions may support treatment. They may not add points to the permanent disability rating.

The treatment point matters. The rating limit does not cut off care. A worker may still need counseling. A worker may still need medication. Sleep care may still be needed. Related treatment can remain part of the claim even when the condition does not add rating points.

When can a psychiatric rating still increase disability?

The statute keeps two psychiatric-rating exceptions. A psychiatric impairment may still increase the rating after a violent act. It may also apply after direct exposure to a significant violent act. The second path is a catastrophic injury. The statute gives examples: limb loss, paralysis, severe burn, and severe head injury.

Those exceptions depend on proof. The medical record must connect the psychiatric injury to the event. A severe injury alone may not answer every rating issue. The report should explain the event. It should state the diagnosis. It should address causation. It should explain impairment. It should say why the exception applies.

What the statute does not close off

Labor Code 4660.1 does not block permanent total disability under Labor Code 4662. That point matters in severe cases. A worker is not locked into a partial rating when the evidence supports permanent total disability under the separate rule.

The statute also keeps the Guzman decision in place. A doctor may use a reasoned approach within the AMA Guides when a strict table value does not fairly describe the impairment. The explanation must be medical. It must be based on substantial evidence. It is not a shortcut around the statute.