Permanent Disability Ratings in Workers' Comp

A permanent disability rating is a percentage a doctor assigns after your injury has healed as much as it's going to heal (called "maximum medical improvement," or MMI) — and that percentage is what workers' comp uses to calculate how much you get paid for a permanent loss. If the rating feels too low, you generally have the right to get a second opinion, submit your own doctor's rating, and formally dispute it through your state's workers' comp system — but there are deadlines, so don't sit on it.

What "MMI" and "impairment rating" actually mean

Workers' comp benefits move through phases. First you get medical treatment and, if you're out of work, temporary disability payments. At some point your treating doctor (or an evaluating doctor) decides your condition has stabilized — it's not going to get meaningfully better or worse with more treatment. That point is Maximum Medical Improvement, or MMI. You can be at MMI and still have real, permanent problems; MMI just means further treatment isn't expected to change the outcome.

Once you're at MMI, if you're left with some lasting loss of function, the doctor assigns an "impairment rating" — usually a percentage, like "10% impairment of the right arm" or "5% whole person impairment." Most states have doctors use a standardized reference for this, most commonly some edition of the American Medical Association's Guides to the Evaluation of Permanent Impairment, though a handful of states use their own rating systems. Which edition or system applies depends on your state's rules, so don't assume your rating was done under the "right" version without checking.

Scheduled losses vs. unscheduled (whole-body) losses

This is one of the most important — and most misunderstood — distinctions in permanent disability claims.

• Scheduled losses apply to specific body parts that appear on a state's "schedule": things like an arm, leg, hand, foot, fingers, toes, eyes, or hearing. Each listed body part is assigned a maximum number of weeks of compensation in the state's law. Your impairment percentage for that body part is applied against that maximum to calculate how many weeks you're paid for.
• Unscheduled (or "whole body"/"whole person") losses generally cover injuries that don't fit neatly on the schedule — commonly the spine, back, neck, torso, internal organs, or psychological injuries, and sometimes any injury once it's rated as affecting the whole person rather than one limb. These are usually compensated differently: some states pay based on a whole-person percentage times a set number of weeks, while others tie the benefit more directly to how much the injury actually reduces your ability to earn wages (sometimes called "loss of wage-earning capacity"), which can bring your age, education, job skills, and the local job market into the calculation, not just the medical percentage.

Whether your injury lands on the schedule or gets treated as unscheduled can change the payout formula significantly, and the line between the two isn't always obvious — a shoulder or hip injury, for example, is treated as scheduled in some states and unscheduled in others. This is entirely state-specific, so this is one of the first things worth confirming with your state's workers' comp agency or a local attorney.

How a rating converts into an actual dollar benefit

The mechanics vary by state, but the rating typically feeds into a formula that looks something like this in concept:

• Impairment percentage (from the doctor's rating)
• × a maximum number of weeks assigned to that body part (for scheduled losses) or a state formula for whole-person impairment
• × your compensation rate, which is usually a percentage of your average weekly wage before the injury, subject to state minimums and maximums

Some states also allow adjustments for factors like age, occupation, or actual wage loss after the injury, especially for unscheduled/whole-body cases. Because the specific weeks-per-body-part tables, wage percentages, and caps are set individually by each state's statute and change over time, there's no single number that applies everywhere — treat any specific figure you see online (including generic examples) as illustrative only, and confirm the actual numbers with your state's workers' comp board, an approved calculator, or an attorney.

Why ratings come in low — and what you can do about it

Impairment ratings are supposed to be objective medical measurements, but in practice they involve judgment calls, and the doctor doing the rating isn't always neutral:

• If the rating doctor was chosen or paid by the employer's insurance company, there can be pressure (conscious or not) toward a lower number.
• Doctors sometimes use an outdated edition of the rating guide, misapply a formula, miss a body part entirely, or fail to account for how the injury affects related structures (a knee injury that also strains the hip and back, for example).
• Pain, loss of range of motion, and reduced strength are sometimes measured inconsistently between exams.

What to do if you think your rating is too low

1. Get the written rating report. Ask for the actual report showing the percentage, the guide/edition used, and the doctor's measurements — not just a summary letter.
2. Have your own doctor review it or perform a second rating. Many states allow you to see your own treating physician or an independent doctor for a second impairment rating, sometimes at the insurer's expense.
3. Request an Independent Medical Examination (IME) if your state allows it, or ask that the case go to a designated neutral evaluator used by your state's workers' comp system.
4. Compare the two ratings. If your doctor's number is meaningfully higher, that difference is usually the basis for a dispute.
5. File a formal dispute or request a hearing with your state workers' comp board, commission, or appeals division. States generally set a specific form and a specific deadline for challenging a rating or a benefit denial — missing that deadline can mean losing the right to challenge it at all, so confirm your state's actual deadline as soon as you get the rating, rather than assuming you have plenty of time.
6. Consider getting a workers' comp attorney involved before the hearing, especially if the dispute is over a permanent, whole-body, or high-value injury. Workers' comp attorneys typically work on a contingency basis (a percentage of the increased benefit they recover), and many offer a free initial consultation.
7. Keep working with your treating doctor on documentation — ongoing symptoms, functional limitations, and any subsequent worsening should be in the medical record, since ratings can sometimes be revisited if your condition changes.

A few things worth keeping in mind

• An impairment rating measures medical loss of function — it is not the same thing as whether you can still do your specific job. Some states account for vocational impact separately; others don't.
• Signing a settlement or accepting a permanency award can sometimes close out your right to reopen the claim later, even if your condition worsens. Understand what you're giving up before you sign anything final.
• If you had a pre-existing condition in the same body part, insurers sometimes argue that some of the current impairment is "old," which can lower the rating attributed to the work injury. This is a common area of dispute and often where a second opinion helps most.
• Deadlines to dispute a rating, request a hearing, or appeal a decision are set by state law and are generally strict. Don't wait to find out what yours is.

This article is general information, not legal advice, and workers' compensation rules vary significantly by state — confirm current rules and deadlines with your state's workers' compensation agency or a licensed attorney in your state.