On This page
    worker welding

    In South Carolina workers’ compensation cases, the impairment rating assigned by your doctor is a major factor in calculating what your case will be worth. That’s because your impairment rating plays a key role in determining the value of your permanent disability benefits.

    Unfortunately, many injured workers are left confused about how impairment ratings work, who assigns them, and whether they can be challenged.

    If you’ve been hurt on the job, especially if you required surgery, missed a lot of time at work, or have permanent limitations, an incorrect or unfair rating could be robbing tens of thousands of dollars out of your pocket.  Working with an experienced South Carolina workers’ compensation attorney can ensure that doesn’t happen. Let an attorney from Joye Law Firm Injury Lawyers help protect your rights, challenge low ratings, and pursue the full compensation you deserve.  We’re proud members of the Injured Workers’ Advocates and SC Workers’ Compensation Educational Association, and we’re honored to help level the playing field for injured workers.  Get started today with a free, confidential case evaluation with our team. We’ll listen to your story and explain your options.

    What is an Impairment Rating?

    In a South Carolina workers’ comp claim, an impairment rating is a percentage estimate of permanent physical loss or limitation in a specific body part.

    For example:

    • 10% impairment of the arm
    • 15% impairment of the knee
    • 20% impairment of the spine

    Doctors typically assign these percentages after you have reached a stage called maximum medical improvement or MMI. When assigning the ratings, many physicians rely on guidelines published by the American Medical Association (AMA).

    What Is Maximum Medical Improvement (MMI)?

    If your doctor determines you have reached maximum medical improvement (MMI), it means:

    • Your condition has stabilized
    • Further treatment is not expected to significantly improve your injury

    This does not mean you are fully healed. It simply means your recovery has reached the point where doctors can evaluate any permanent damage or limitations.

    Once MMI is reached, your doctor can assign a permanent impairment rating.

    Learn more about Maximum Medical Improvement

    Why Independent Medical Exams Are Sometimes Needed

    In South Carolina workers’ compensation cases, the insurance company usually chooses your doctor. While many authorized doctors provide fair and accurate evaluations, the reality is that doctors selected by the insurance carrier may take a more conservative approach when assigning an impairment rating.

    Another factor that can affect the rating is the medical guideline the doctor uses. South Carolina law does not require physicians to rely on a specific edition of the AMA’s Guides to the Evaluation of Permanent Impairment. Different editions can produce very different results.

    As Joye Law Firm Managing Partner Ken Harrell often explains to injured workers, most people have no reason to know different impairment guides even exist. For example, the 5th edition of the AMA Guides is generally considered more favorable to injured workers. The 6th edition often produces much lower impairment ratings. Because of this difference, the edition a doctor relies on can have a major impact on the outcome of a case.image of patient sitting with medical employee

    If your rating appears unusually low or is based on a more restrictive guideline,  your attorney can recommend an independent medical examination (IME) with another doctor. Getting that second opinion  can help important issues such as:

    • The accuracy of the impairment rating
    • Future medical treatment needs
    • Permanent work restrictions

    Even a small increase in the impairment percentage can significantly change the potential value of your workers’ compensation settlement.

    How Impairment Ratings Affect Workers’ Comp Benefits

    Saying your impairment rating plays a major role in determining the benefits you may receive in a South Carolina workers’ compensation case is no understatement. The percentage assigned by a doctor makes or breaks whether you qualify for permanent partial disability (PPD) or, in more severe cases, permanent total disability (PTD) benefits. Generally, a higher impairment rating reflects a greater loss of physical function, which can lead to higher compensation.

    In many cases, the rating is applied to South Carolina’s scheduled body part system, which assigns a specific number of weeks of compensation to different body parts under state law. For example:

    • The arm is valued at 220 weeks of compensation
    • A 10% impairment rating of the arm equals 22 weeks of benefits

    Those weeks are then multiplied by your weekly compensation rate, which is typically 2/3 of your average weekly wage before the injury.

    If you want to better understand how these scheduled values work, you can explore our guide on workers’ comp body part values in South Carolina, which breaks down how the law assigns compensation to different injuries.

    How Impairment Ratings Impact Workers’ Comp Payouts

    Impairment ratings are also central to settlement calculations. Insurance companies often begin negotiations using the impairment percentage as a baseline. Because the rating is a medically supported measurement of your permanent limitations, it can serve as powerful evidence during settlement discussions. A higher impairment rating may provide greater leverage in negotiations and can significantly influence the final value of a case.

    In situations where a lump-sum settlement is considered, the impairment rating helps quantify the long-term impact of your injury and plays a critical role in determining a fair settlement amount. For workers with extremely severe injuries, a very high rating, approaching or reaching 100 percent, may support a claim for permanent total disability benefits, which can lead to lifetime compensation.

    Still, it’s important to remember that an impairment rating is only the starting point for evaluating a workers’ compensation case. Other factors, including your wages, future medical needs, work restrictions, and ability to return to employment, may also influence the final outcome.

    Impairment Is Not the Same as Disability

    South Carolina law does not award benefits strictly based on impairment ratings.

    Instead, Workers’ Compensation Commissioners consider the overall disability caused by the injury, which may include:

    • Your age
    • Education level
    • Job history and training
    • Permanent work restrictions
    • Ability to return to similar employment

    Because of these additional factors, many workers’ compensation settlements are higher than the doctor’s impairment percentage alone would suggest.

    Impairment Ratings Are Only One Piece of the Puzzle

    Although impairment ratings are important, they represent only one part of how workers’ compensation cases are valued.

    Other major factors include:

    • Your weekly compensation rate
    • The body part(s) injured
    • Future medical treatment
    • Whether you can return to work

    If you want a broader explanation of how these pieces fit together, see our guide explaining what determines the value of a workers’ compensation case. If you want to cut to the chase, give us a call.

    Get Help from an Experienced Workers’ Compensation Attorney at Joye Law Firm Injury Lawyers

    If you were injured on the job, your wages, future medical needs, and ability to return to work could all hinge on doing this the right way. Tiny mistakes can negatively influence the final value of your claim and leave you on the hook for medical bills. The stakes are too high to go without an experienced workers’ compensation attorney by your side.

    Not only does our team bring decades of experience fighting for injured workers across South Carolina, but we’re also consistently recognized for our leadership and results:

    • The Best Lawyers in America® “Lawyer of the Year” for Workers’ Compensation – Claimants
      • Managing Partner Ken Harrell was selected in 2026, 2021, and 2015
      • Head of our Workers’ Compensation Department, Matt Jackson in 2024
    • Leadership roles and active involvement within the South Carolina legal community, including:
      • Ken Harrell, Past President of Injured Workers’ Advocates, current Chair of the Legislative Affairs Committee, and Board Member of the South Carolina Workers’ Compensation Association
      • Mark Joye, Past President of the Charleston County Bar Association and South Carolina Association of Justice
      • Matt Jackson, Past President of Injured Workers’ Advocates and long-serving Executive Committee member
      • Davis Rice, former Executive Committee Member of Injured Workers’ Advocates
    • A proven track record of securing meaningful results for injured workers and their families
    • Thousands of positive Google reviews from previous clients

    These recognitions reflect not just legal skills, but also our deep commitment to standing up for what’s right. Our driving purpose is helping injured underdogs level the playing field against powerful interests and insurance companies.

    Let our experienced South Carolina workers’ compensation attorneys guide you through the process. We can review your case, ensure your impairment rating is fair, and help pursue the full benefits you may be entitled to.

    If you have questions about your injury or your impairment rating, speaking with a knowledgeable a member of our team can help you make informed decisions about your recovery and your future. The call is free and confidential.

    Contact us
    Joye Law Firm Injury Lawyers's Ryan LeBlanc - attorney working on his computer