AMA Guidelines for Workers’ Compensation

How is Workers’ Comp Regulated?

Every year, thousands of workers are injured on the job. By filing for workers’ compensation, they could have their resulting medical expenses covered by their employer’s insurance. But how can they know if they receive a fair amount of compensation? What prevents them from receiving a lesser payout than another employee in their state with a similar injury or disability? This is where the American Medical Association (AMA) comes in.

Determining Permanent Impairment

The AMA is responsible for publishing and distributing the “Guides to the Evaluation of Permanent Impairment” to qualified physicians. This publication-now in its’ 5th Edition – required under California Labor Code § 4660.1(a) – is used as a reference for doctors in order to properly and regularly determine the level of an injured worker’s impairment or disability. If a person is impaired, they have suffered damage or injury that does not affect their ability to perform their job or live their day to day life. This could be temporary impairment, but if they reach maximum medical improvement (MMI), they are permanently impaired. However, if their work productivity or day-to-day living is affected, they are disabled, either temporarily or permanently.

Without such guidelines, the diagnoses of each person’s injuries, impairment, and/or disability would be irregular and so would the amount of compensation they received. Even with the AMA guidelines in place, it is still wise to hire a Walnut Creek workers’ comp lawyer to help ensure that your doctor provides a satisfactory diagnoses that brings you maximum compensation for your workplace accident.

To speak with such a lawyer, call Brand Peters PC at (925) 489-0746 today.

What Is the Difference Between Impairment and Disability?

Impairment is a medical determination: your physician measures how much a workplace injury has damaged a body part or system, expressed as a whole person impairment (WPI) percentage under the AMA Guides. Disability is a legal and administrative determination: it measures how that impairment affects your ability to work, factoring in your age, occupation, and lost earning capacity.

How Does an Impairment Rating Become Compensation?

Once your physician assigns a whole person impairment percentage, California’s Disability Evaluation Unit (DEU) converts that percentage into your final permanent disability rating using the Permanent Disability Rating Schedule, adjusted for your occupation and age. Two workers with identical injuries can receive different compensation if their jobs differ in physical demand.

Can You Challenge a Low Impairment Rating?

Yes. The AMA Guides are not always a perfect fit for every injury — conditions involving chronic pain, fatigue, or subjective symptoms can be undervalued. Under the Almaraz/Guzman legal standard, a physician may use an alternative rating method from within the AMA Guides when the standard approach doesn’t accurately capture your impairment. An attorney can request a supplemental report, seek review by a Qualified Medical Evaluator (QME), or argue for this alternative approach on your behalf.

AMA Guidelines Frequently Asked Questions

What edition of the AMA Guides does California use?

California requires the AMA Guides to the Evaluation of Permanent Impairment, 5th Edition — not the 6th Edition. This has been the standard since 2005 under Labor Code § 4660.1(a) (SB 899). An impairment rating based on the wrong edition can be challenged and rejected.

What is the difference between impairment and disability in workers’ comp?

Impairment is a medical measurement of how much an injury has damaged your body, rated as a whole person impairment percentage. Disability is a legal determination of how that impairment affects your ability to work, factoring in your age, occupation, and lost earning capacity.

What is maximum medical improvement (MMI)?

Maximum medical improvement (MMI) is the point at which your treating physician determines your condition has stabilized and is unlikely to significantly improve with further treatment. Once you reach MMI, any remaining impairment is considered permanent, and your doctor can issue a formal impairment rating.

Who decides my impairment rating?

Your treating physician typically issues the first impairment rating once you reach MMI. If you or the insurance company disputes that rating, the case goes to a Qualified Medical Evaluator (QME) or an Agreed Medical Evaluator (AME), who reassesses using the same AMA Guides standard.

How is my impairment rating turned into a dollar amount?

Your physician’s whole person impairment percentage is submitted to California’s Disability Evaluation Unit, which applies your occupation and age to the Permanent Disability Rating Schedule to calculate a final percentage. That percentage determines how many weeks of benefits you receive and your weekly payment amount.

Can I challenge a low impairment rating?

Yes. If your physician’s rating seems too low, you can request a supplemental report, seek review by a Qualified Medical Evaluator, or — under the Almaraz/Guzman legal standard — argue for an alternative rating method within the AMA Guides framework that more accurately reflects your actual impairment.

Do the AMA Guides always accurately reflect my injury?

Not always. The Guides are based on measurable, objective findings, which can undervalue conditions involving chronic pain, fatigue, or subjective symptoms. This is part of why supplemental medical reporting and legal review of impairment ratings matter.