The shorthand on workers’ compensation paperwork is not decorative. Each of the common workers’ compensation acronyms points to a specific decision about how much you’re paid, what treatment gets approved, and when your claim closes. The glossary below walks through the terms you’re most likely to see from the first injury report through final settlement, grouped by what they actually control.
Medical Status After the Injury
MMI — Maximum Medical Improvement. This is the point where your doctor decides your condition has stabilized and more treatment won’t produce meaningful improvement. MMI does not mean you’re healed. It means the injury has plateaued, and whatever symptoms remain are likely permanent. The physician documents any lasting limitations in a formal report, and that report becomes the foundation for your permanent disability benefits.
IR — Impairment Rating. After you reach MMI, your doctor assigns a percentage that quantifies how much your injury has reduced your body’s overall function. Most states require physicians to use the AMA Guides to the Evaluation of Permanent Impairment, which supplies a standardized framework for measuring permanent loss.1American Medical Association. AMA Guides to the Evaluation of Permanent Impairment Overview The rating is expressed as a percentage of whole person impairment, or WPI. A 10% WPI rating for a shoulder injury means the physician has determined that 10% of your total body function has been permanently compromised. That percentage feeds directly into the dollar amount of your permanent disability award, though the exact formula varies by state.
IME — Independent Medical Examination. An IME is a second opinion performed by an outside physician, typically chosen by the insurance carrier. The insurer requests one when it wants to challenge your diagnosis, the necessity of a proposed treatment, or whether you’ve actually reached MMI. The examining doctor reviews your records, performs a physical exam, and produces a report. IME findings frequently contradict your treating physician’s conclusions, and insurers often use them to justify reducing or denying benefits. If you disagree with the IME, you generally have the right to challenge it through your state’s dispute process.
FCE — Functional Capacity Evaluation. An FCE is a battery of standardized physical tests that measure what you can actually do: how much you can lift, how long you can sit or stand, whether you can grip, bend, or climb. A trained evaluator builds a profile of your current abilities and limitations from the results. FCE findings decide whether you can return to your old job, need modified duties, or qualify for vocational rehabilitation.
Wage Terms That Set Your Check
AWW — Average Weekly Wage. Almost every benefit check you receive is a fraction of this one number. Your AWW is calculated from your gross earnings before taxes and deductions during a set period before the injury, usually the prior 52 weeks. Overtime, bonuses, and secondary employment may or may not count depending on your state’s rules. Every disability payment formula starts here, so an incorrect AWW makes every subsequent check wrong. If your employer reports a figure that looks low, request the underlying payroll records and challenge it early.
Compensation Rate. This is the weekly dollar amount you actually receive, calculated as a fraction of your AWW. In most states, total disability pays roughly two-thirds of AWW, subject to a state-imposed minimum and maximum. Those caps change annually, and the maximum weekly benefit matters a great deal if you’re a higher earner. Your compensation rate appears on your benefit notices and is worth verifying against your pre-injury wages.
The Four Disability Benefit Categories
Workers’ compensation sorts disability benefits by two variables: temporary or permanent, and total or partial. The four combinations each carry different eligibility rules, payment structures, and durations.
TTD — Temporary Total Disability. TTD payments start when your injury keeps you from working at all while you recover. These are the most common disability benefits and typically pay about two-thirds of AWW. TTD continues until one of three things happens: your doctor releases you to return to work, you reach MMI, or you hit your state’s statutory maximum duration.
TPD — Temporary Partial Disability. TPD applies when you return to work in a limited capacity but earn less than you did before the injury. It compensates for the gap between your reduced earnings and your pre-injury wages. If you were earning $900 per week and your light-duty job pays $500, TPD covers a portion of that $400 difference. Payments end when you reach MMI or return to full earnings.
PPD — Permanent Partial Disability. PPD covers lasting impairments that reduce your physical function but don’t completely prevent you from working. This is where your impairment rating turns into money. States use two main approaches: a schedule of injuries that assigns a fixed number of weeks of compensation for specific body parts (such as 200 weeks for loss of use of a hand), or a percentage-based system tied to your WPI rating. Dollar amounts vary significantly by state, body part, and severity.
PTD — Permanent Total Disability. PTD is reserved for the most severe injuries, where you can never return to any gainful employment. Some states presume PTD for catastrophic injuries like the loss of both hands, total blindness, or severe brain injury. Others require medical evidence and vocational testimony showing no employer would reasonably hire you given your limitations. PTD is typically paid for life or until retirement age, making it the most valuable category of workers’ compensation benefits.
How Treatment Gets Approved or Denied
UR — Utilization Review. UR is the gatekeeping process insurers use to decide whether a treatment your doctor recommends is medically necessary. When your doctor requests authorization for surgery, physical therapy, a prescription, or an advanced diagnostic test, the request goes to a utilization review organization. A physician reviewer who may never examine you evaluates whether the proposed care aligns with evidence-based medical guidelines. If the reviewer denies treatment, you and your doctor receive a written explanation with the clinical reasons and instructions for appealing. UR denials are one of the most common sources of friction in workers’ compensation claims, and appeals succeed often enough to be worth pursuing. Many states have adopted specific treatment guidelines that insurers use as the benchmark during this review; if your doctor’s plan falls within them, approval is more likely, and if it doesn’t, your doctor may need to explain why your case warrants an exception.
MPN — Medical Provider Network. An MPN, or authorized provider list, is a roster of doctors and specialists approved to treat injured workers. In many states, your employer or its insurer controls which doctors you can see, at least initially. Some states let you switch to your own physician after a certain number of visits or a waiting period. Others give you free choice of doctor from the start. Seeing an unauthorized provider can leave you personally responsible for the bill, so knowing your state’s rules on physician choice matters.
How a Claim Closes
C&R — Compromise and Release. A C&R is a lump-sum settlement that closes your claim permanently. You receive a single payment covering your remaining disability benefits and, in most cases, all future medical care related to the injury. Once approved, a C&R is final. You cannot reopen the claim later, even if your condition worsens. The trade-off is speed and certainty: you get your money now instead of waiting for biweekly checks that could be disputed or interrupted.
Stips — Stipulated Award. With a stipulated award, you and the insurer agree on your disability rating and weekly benefit, but future medical treatment for the accepted injury stays open. Payments come over time rather than in a lump sum, and you keep the right to medical care for the injury, sometimes for life. Stips offer less money upfront but more long-term protection if your condition requires ongoing treatment. Choosing between a C&R and a stipulated award is one of the most consequential decisions in any workers’ compensation case.
WCMSA — Workers’ Compensation Medicare Set-Aside Arrangement. A WCMSA comes into play when you’re settling a claim and you’re either already on Medicare or expect to enroll within 30 months. The arrangement allocates part of your settlement into a separate account dedicated to paying for future injury-related medical care that Medicare would otherwise cover. The money in that account must be spent down before Medicare picks up the tab. CMS reviews a proposed WCMSA when the claimant is already a Medicare beneficiary and the settlement exceeds $25,000, or when Medicare enrollment is expected within 30 months and the total settlement exceeds $250,000.2Centers for Medicare & Medicaid Services. Workers’ Compensation Medicare Set Aside Arrangements Ignoring WCMSA requirements can jeopardize your Medicare eligibility for injury-related treatment.
Who You Deal With on the Claim
TPA — Third-Party Administrator. A TPA is an outside company hired by your employer or insurer to handle the day-to-day processing of your claim. TPAs manage paperwork, coordinate payments, and serve as the primary point of contact for claimants. When you call about a late check or a treatment authorization, you’re usually talking to the TPA rather than the insurance carrier itself.
Adjuster. The adjuster is the individual assigned to manage your specific case. They review medical reports, authorize or deny treatment requests, calculate benefit payments, and decide whether your claim is accepted or disputed. Their decisions control the pace of your medical care and the flow of your checks. Adjusters handle large caseloads, so being organized, responsive, and persistent makes a real difference in how quickly things move.
QRC — Qualified Rehabilitation Consultant. A QRC is a vocational specialist who helps injured workers get back to work. QRCs develop return-to-work plans, coordinate with your employer on modified duty, and connect you with retraining programs when your injury rules out your old job. Not every state uses this exact title, but vocational rehabilitation services exist in most workers’ compensation systems when an injury creates long-term barriers to employment.
Appeals Board or Commission. This is the state-level body that resolves disputes between injured workers and insurance carriers. Some states call it a Workers’ Compensation Appeals Board, others a Workers’ Compensation Commission or Industrial Commission, but the function is the same: hearing evidence and issuing decisions when a claim is denied, benefits are disputed, or medical treatment is contested. The federal equivalent is the Employees’ Compensation Appeals Board, which handles claims by federal employees under the Federal Employees’ Compensation Act.3U.S. Department of Labor. Employees’ Compensation Appeals Board
Legal Tests That Decide Whether You’re Covered
AOE/COE — Arising Out of Employment and in the Course of Employment. This two-part legal test decides whether your injury qualifies for workers’ compensation at all. “Arising out of employment” means the injury was caused by a risk connected to your job, not a purely personal one. “In the course of employment” means it happened while you were doing work-related activities during work hours or in a work-related location. Both halves must be satisfied. An injury on your lunch break at a restaurant across town might fail the course-of-employment test even though you wouldn’t have been there but for your job. This threshold, called compensability, is the first hurdle every claim must clear before any benefits are paid.
Exclusive Remedy. This is the foundational bargain of the workers’ compensation system. You get guaranteed medical care and wage replacement without having to prove your employer was at fault. In exchange, you give up the right to sue your employer in civil court for negligence. The system trades the possibility of a larger jury verdict for the certainty of benefits. Exceptions exist in most states when the employer acted intentionally or engaged in egregious misconduct, but they’re narrow and hard to prove.
Subrogation. Subrogation is the insurer’s right to recover money it paid on your claim when a third party was responsible for the injury. If a delivery driver runs a red light and injures you while you’re working, workers’ compensation pays your medical bills and lost wages immediately, and the insurer can then pursue the at-fault driver or their insurance company for reimbursement. If you file your own personal injury lawsuit against the third party, the workers’ compensation carrier has a lien on your recovery, meaning part of any settlement or verdict goes back to the carrier. Subrogation directly affects how much money you keep from a third-party lawsuit.4U.S. Department of Labor. Third Party Liability
Where Workers’ Comp Meets Federal Programs
SSDI Offset. This applies when you receive both workers’ compensation and Social Security Disability Insurance at the same time. Federal law caps the combined total of both benefits at 80% of your average pre-disability earnings.5Office of the Law Revision Counsel. United States Code Title 42 – Section 424a If the combined amount exceeds that cap, Social Security reduces your SSDI payment. Some states reverse the offset so that the workers’ compensation benefit is reduced instead, which can work in your favor since SSDI brings additional advantages like Medicare eligibility. The offset is one of the most financially significant details in a long-term disability claim, and getting it wrong can cost thousands per year.
MSP — Medicare Secondary Payer. MSP is the federal rule that makes workers’ compensation the primary payer for injury-related medical care when you’re also on Medicare. Medicare will not pay for treatment that workers’ compensation is responsible for covering. The rule is enforced through reporting requirements: workers’ compensation plans must identify whether claimants are entitled to Medicare benefits, and noncompliance can result in civil penalties of up to $1,000 per day.6Office of the Law Revision Counsel. 42 U.S. Code 1395y – Exclusions From Coverage and Medicare as Secondary Payer MSP is the reason WCMSAs exist: they protect Medicare’s financial interest in settlements by ensuring future injury-related care is paid from the settlement before Medicare steps in.
Tax Treatment. Workers’ compensation benefits are completely exempt from federal income tax under the Internal Revenue Code.7Office of the Law Revision Counsel. United States Code Title 26 – Section 104 You do not report these payments as income, and you cannot deduct them either. One exception: if you receive both workers’ compensation and SSDI, the SSDI offset can make a portion of your Social Security benefits taxable, because the IRS taxes SSDI differently than workers’ compensation. The workers’ compensation benefits themselves remain tax-free, but the interaction between the two programs creates a wrinkle worth discussing with a tax professional.
The Deadlines That Override Everything Else
Two separate clocks start running the moment you’re injured at work. The first is the notice deadline, which is how quickly you must tell your employer about the injury. Most states require notice within 30 days, though some allow as few as 10 days and others simply say “as soon as possible.” Missing it can give the insurer grounds to deny your entire claim, regardless of how serious the injury is.
The second clock is the statute of limitations for filing a formal claim with your state’s workers’ compensation agency. The most common deadline is around two years from the date of injury, but it varies significantly by state. Occupational diseases and repetitive stress injuries often have different rules because the date of injury isn’t always obvious; some states start the clock when you first knew or should have known the condition was work-related. If you’re anywhere near a deadline and haven’t filed, that’s the single most urgent thing to address. No acronym in this glossary matters if your claim is time-barred.