How permanent partial disability ratings work in workers comp: impairment rating methods, scheduled vs. unscheduled injuries, and how PPD ratings translate to settlement value in 2026.
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This page does not publish fake verdicts, invented claim averages, or testimonials. Dollar examples are labeled as hypothetical worksheets. PPD formulas and scheduled weeks shown here are illustrative and must be verified against each state's current statute.
A permanent partial disability rating in workers comp is a medical assessment that quantifies how much lasting functional loss a workplace injury caused. Expressed as a percentage, this rating is the single most important factor in determining PPD benefit amounts. A 10 percent impairment rating to the arm, for example, means the evaluating physician determined that the injured worker has permanently lost 10 percent of the arm's normal function.
PPD ratings are assigned after you reach maximum medical improvement (MMI) -- the point where your condition has stabilized and further treatment is not expected to produce substantial improvement. This timing matters because settling before MMI risks undervaluing permanent damage that has not yet fully declared itself.
Most states divide PPD injuries into two categories that are calculated differently.
Scheduled injuries involve body parts listed in the state workers comp statute with a fixed number of benefit weeks. Common scheduled body parts include arms, legs, hands, feet, fingers, toes, eyes, and ears. The benefit is calculated by multiplying the impairment percentage by the number of scheduled weeks, then multiplying by the weekly benefit rate.
Unscheduled injuries affect body areas not on the schedule -- typically the back, neck, head, trunk, or internal organs. These are usually calculated based on whole-person impairment percentage, loss of earning capacity, or a combination. Unscheduled injuries are often more complex to value because they may involve vocational assessments and wage-loss evidence.
States use different formulas and different numbers of scheduled weeks. The table below shows illustrative scheduled-loss weeks for selected body parts in several states. These numbers change when statutes are amended -- verify with the current state workers comp schedule.
| Body part | Concept | Calculation method (general) |
|---|---|---|
| Arm (at shoulder) | Scheduled loss | Impairment % x state-scheduled weeks for arm x weekly comp rate |
| Leg (at hip) | Scheduled loss | Impairment % x state-scheduled weeks for leg x weekly comp rate |
| Hand | Scheduled loss | Impairment % x state-scheduled weeks for hand x weekly comp rate |
| Foot | Scheduled loss | Impairment % x state-scheduled weeks for foot x weekly comp rate |
| Finger (index) | Scheduled loss | Impairment % x state-scheduled weeks for that finger x weekly comp rate |
| Eye (loss of vision) | Scheduled loss | Impairment % x state-scheduled weeks for eye x weekly comp rate |
| Back / spine | Unscheduled (most states) | Whole-person impairment % applied to state formula, often involving earning capacity analysis |
| Head / brain | Unscheduled (most states) | Whole-person impairment % or loss of earning capacity assessment |
Many states require or reference the American Medical Association (AMA) Guides to the Evaluation of Permanent Impairment. However, states use different editions: some use the 5th edition, others the 6th edition, and some use their own state-specific rating guides. The edition matters because the same injury can produce a different percentage under different editions. Florida, for example, uses the Florida Uniform Permanent Impairment Rating Schedule rather than the AMA Guides. California uses its own Permanent Disability Rating Schedule.
The evaluating physician applies the applicable guide to clinical findings -- range of motion measurements, imaging results, neurological examination, strength testing, and functional assessments -- to assign a whole-person or body-part impairment percentage.
A construction worker earning $1,100 per week suffers a knee injury requiring surgery. After reaching MMI, the treating physician assigns a 20 percent impairment rating to the leg. The state schedule assigns 200 weeks for the leg. The weekly compensation rate is two-thirds of the average weekly wage, capped at the state maximum.
Calculation: 20% x 200 weeks = 40 weeks of PPD benefits. If the weekly rate is $733 (two-thirds of $1,100), the PPD benefit equals $733 x 40 = $29,320. This does not include temporary disability benefits already paid during recovery, future medical care if left open, or any third-party personal injury claim if someone other than the employer caused the injury.
If you believe the impairment rating is too low, several options exist depending on state procedure. You can request an independent medical examination (IME) with a physician of your choosing. You can obtain a second opinion that applies the same rating guide and identifies where the original evaluator underrated specific impairments. In some states, you can request a state-appointed medical examiner to resolve disputes. An attorney experienced in workers comp can identify whether the rating methodology was properly applied, whether all injured body parts were rated, and whether the correct edition of the rating guide was used.
A permanent partial disability (PPD) rating is a medical assessment expressed as a percentage that describes how much permanent functional loss a workplace injury caused to a specific body part or to the whole person. This rating directly affects your workers comp settlement or award amount.
The treating physician, an independent medical examiner (IME), or a state-appointed physician typically assigns the rating. Many states require or reference the AMA Guides to the Evaluation of Permanent Impairment. The insurance company may request its own IME, which can produce a different rating.
Yes. If you believe the rating is too low, you can request an independent medical examination, obtain a second opinion from a qualified physician, or challenge the rating at a workers comp hearing. An attorney experienced in workers comp can help identify whether the rating methodology was properly applied.
Scheduled injuries involve body parts listed in the state statute with a fixed number of weeks of benefits (arms, legs, hands, feet, fingers, toes, eyes, ears). Unscheduled injuries affect the trunk, back, head, or internal organs and are typically calculated based on loss of earning capacity or whole-person impairment.
Generally yes, but not always proportionally. Other factors include the state formula, your average weekly wage, the number of scheduled weeks, whether future medical care is included, and your ability to return to work. A 15 percent rating in a high-wage worker can exceed a 25 percent rating in a lower-wage worker.
The rating is typically assigned after you reach maximum medical improvement (MMI), meaning your condition has stabilized and is not expected to substantially improve with further treatment. This can take months or years depending on the injury.
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