Workers' compensation insurance has its own vocabulary — class codes, experience mods, audits, employers liability, waivers of subrogation. This glossary defines each term in plain English so you can read a quote or policy with confidence.
A
- ACORD 25
- The standard industry form used to issue a certificate of liability insurance, including workers' comp, general liability, and auto. It's produced by ACORD, a nonprofit standards organization, and is the form almost every landlord, client, or general contractor asks for as evidence of coverage.Related: Certificate of Insurance, Certificate Holder, Live Certificate
- Additional Insured (why it does not apply to WC)
- A status added to a liability policy that extends some of its coverage to another party. Workers' comp doesn't work this way because its benefits belong to the injured employee by statute, not to whichever business is named on the certificate, so 'additional insured' status has no meaning on the workers' comp portion of a policy.Related: Certificate of Insurance, Certificate Holder, Employers Liability (Part Two)
- Anniversary Rating Date
- The date each year, usually the effective date of an employer's current policy, on which a new experience modification rate takes effect, calculated from the employer's claims history through a set look-back period ending shortly before that date.Related: Experience Modification Rate (EMR/Mod), Unit Statistical Report
- Assigned Risk Plan
- A state-administered mechanism, part of the residual market, that ensures workers' comp coverage is available for employers who can't find a carrier willing to write them voluntarily, often due to a poor claims history or a high-hazard operation. Coverage is typically priced higher than the voluntary market.Related: Residual Market, State Fund, Monopolistic State
- Audit Noncompliance Charge
- An additional charge or penalty applied to a policy when an employer fails to cooperate with or complete its required year-end payroll audit, since the insurer has no other way to confirm actual payroll and calculate final premium.Related: Payroll Audit, Estimated Payroll
C
- Certificate Holder
- The party named on a certificate of insurance as the one requesting evidence of coverage, such as a landlord, general contractor, or client. Some certificates also arrange for the certificate holder to be notified if the underlying policy is canceled or changes.Related: Certificate of Insurance, ACORD 25, Additional Insured (why it does not apply to WC)
- Certificate of Insurance
- A one-page summary document, most commonly the ACORD 25 form, showing that a business currently carries certain types of insurance, including workers' comp, along with policy numbers and effective dates. It's evidence that a policy exists but isn't itself a contract of insurance.Related: ACORD 25, Certificate Holder, Live Certificate
- Claim Frequency
- How often an employer generates workers' comp claims relative to its payroll or number of employees, as opposed to how expensive each individual claim is. High frequency with low severity is a different risk pattern than the reverse.Related: Claim Severity, Experience Modification Rate (EMR/Mod), Split Point
- Claim Severity
- How costly an individual workers' comp claim turns out to be, as opposed to how often claims occur. A single severe claim can affect an employer's experience mod differently than several smaller claims of the same total cost, since primary and excess losses are weighted differently.Related: Claim Frequency, Split Point, Reserve
- Class Code
- A four-digit number assigned by a rating bureau (NCCI or a state's own bureau) to describe a specific type of business operation or job duty. Payroll is reported under the class code that matches the work performed, and each code carries its own base rate reflecting that work's typical injury risk.Related: Governing Class, Rating Bureau, NCCI, Dual Wage Classification
- Competitive State Fund
- A state-owned workers' comp insurer that competes for business alongside private carriers, rather than being the exclusive source of coverage the way a monopolistic state's fund is. Employers in these states can choose the state fund or a private insurer.Related: State Fund, Monopolistic State, Residual Market
- Cumulative Trauma
- An injury that develops gradually from repeated motions or exposures over time, such as a repetitive-strain injury, rather than from one specific incident. Determining exactly when a cumulative trauma claim 'occurred' can be more complex than with a single-event injury.Related: Occupational Disease, Claim Frequency
D
- Death Benefits
- Statutory payments made to a deceased employee's dependents when a workplace injury or occupational disease results in death, along with a contribution toward burial expenses, both set by state law and paid regardless of fault.Related: Permanent Total Disability, Employers Liability Limits (100/500/100)
- Dividend Plan
- A workers' comp program in which the insurer may return a portion of premium to the policyholder after the policy period if the employer's losses come in better than expected, similar in spirit to retrospective rating but structured as a discretionary dividend rather than a contractual adjustment.Related: Retrospective Rating Plan, Premium Discount
- Drug-Free Workplace Credit
- A premium credit offered in many states to employers who implement a qualifying drug-free workplace program, including a written policy, employee education, and testing, since such programs are statistically associated with fewer workplace injuries and claims.Related: Schedule Credit/Debit, Premium Discount
- Dual Wage Classification
- A rating structure, used by some states for certain construction classifications, where the rate applied depends on whether an employee's hourly wage falls above or below a set threshold, reflecting that better-paid, typically more experienced workers in that trade tend to have fewer claims.Related: Class Code, Governing Class
E
- Employers Liability (Part Two)
- The second half of a standard workers' comp policy, sitting alongside the statutory benefits in Part One. It responds when an injured employee or their family sues the employer directly, outside the workers' comp system, for something the statutory benefit doesn't cover, such as a third party joining the employer in a lawsuit.Related: Part One, Employers Liability Limits (100/500/100), Exclusive Remedy, Third-Party-Over Action
- Employers Liability Limits (100/500/100)
- The standard minimum limits on a workers' comp policy's Part Two coverage: $100,000 per employee for bodily injury by accident, $500,000 policy aggregate for bodily injury by disease, and $100,000 per employee for bodily injury by disease. Higher limits are commonly available and often required by contract.Related: Employers Liability (Part Two), Death Benefits
- ERA (Experience Rating Adjustment)
- A correction applied to an employer's experience modification rate to reflect a change to previously reported loss or payroll data, such as a claim reserve being revised or a payroll audit correcting an error, after the mod was originally calculated.Related: Experience Modification Rate (EMR/Mod), Unit Statistical Report
- Estimated Payroll
- The payroll figure an employer provides at the start of a policy period, used to calculate the initial deposit premium. It's reconciled against actual payroll at the year-end audit, with premium adjusted up or down to match what was actually paid to employees.Related: Payroll Audit, Deposit Premium, Pay-As-You-Go
- Exclusive Remedy
- The core legal tradeoff behind workers' comp: an injured employee generally cannot sue their employer for a workplace injury, and in exchange receives statutory benefits set by law regardless of fault. It's the reason employers liability coverage exists, since exclusive remedy has specific exceptions.Related: Workers' Compensation Insurance, Employers Liability (Part Two), Statutory Employer
- Expense Constant
- A small flat fee added to a workers' comp policy to help cover an insurer's fixed administrative costs of issuing and servicing the policy, applied regardless of the size of the premium or how large or small the business is.Related: Minimum Premium, Premium Discount
- Experience Modification Rate (EMR/Mod)
- A factor, usually calculated by comparing a business's actual claims history to what's expected for its industry and size, that adjusts its workers' comp premium up or down. A mod of 1.00 is neutral; below 1.00 is a credit for better-than-average losses, and above 1.00 is a debit for worse-than-average losses.Related: Split Point, Unit Statistical Report, Anniversary Rating Date, Schedule Credit/Debit
- Extraterritorial Coverage
- A policy's ability to respond when an employee is injured while temporarily working in a state other than the one where the employer is primarily based, subject to that other state's rules and often reinforced by the policy's other-states insurance provision.Related: Other States Insurance (Item 3.C), Voluntary Compensation, USL&H
F
- First Report of Injury
- The initial form filed with the insurer and, in most states, a state agency when a workplace injury occurs, documenting the basic facts of the incident. It opens the formal claim file and starts the claims-handling process.Related: Loss Runs, Medical-Only Claim, Indemnity Claim
G
- Ghost Policy (owner-only certificate policy)
- An informal industry term for a workers' comp policy written for a business with no employees, purchased solely so the owner can produce a certificate of insurance for a general contractor or client. This agency does not offer this type of policy; coverage here requires actual employees on payroll.Related: Sole Proprietor Election, Certificate of Insurance, Officer Exclusion
- Governing Class
- The single classification that best describes a business's main operations and typically carries the largest share of its payroll. It's used for certain rating purposes, like applying expense constants, even when a business also reports payroll under one or more secondary classifications.Related: Class Code, Standard Exception, NCCI
- Group Self-Insurance
- An arrangement in which multiple smaller employers, often in the same industry or trade association, pool their resources to self-insure workers' comp together, sharing the risk and administrative costs rather than each business self-insuring entirely on its own.Related: Self-Insurance, Safety Group
H
- Hazard Group
- One of several letter-coded groups (A through G) that NCCI sorts class codes into based on their relative potential for large claims, used to set appropriate pricing factors for options like retrospective rating and large deductibles.Related: Class Code, NCCI, Retrospective Rating Plan
I
- Indemnity Claim
- A workers' comp claim that includes wage-replacement benefits because the employee missed work beyond the state's waiting period, in addition to any medical treatment. These claims carry more weight in experience rating than medical-only claims.Related: Medical-Only Claim, Claim Severity, Experience Modification Rate (EMR/Mod)
- Independent Contractor
- A worker who is genuinely in business for themselves and controls how their work gets done, as opposed to an employee under an employer's direction and control. Only employees are covered by and counted toward workers' comp; a business's independent contractors generally are not.Related: Misclassification, Statutory Employer, PEO
- Independent Medical Exam
- An evaluation by a physician who hasn't been treating the employee, typically requested by the insurer, used to get a second opinion on diagnosis, treatment, or whether the employee has reached maximum medical improvement in a disputed claim.Related: Maximum Medical Improvement, Claim Severity
J
- Jones Act
- A federal law that lets an injured seaman sue their employer for negligence, unlike most shore-based workers who are limited to the workers' comp system. It applies to crew members of a vessel rather than dockside or shore-based employees, who typically fall under USL&H instead.Related: USL&H, Exclusive Remedy
L
- Large Deductible
- A policy structure in which the employer reimburses the insurer for claim costs up to a large per-claim deductible, often tens of thousands of dollars or more, in exchange for a lower up-front premium. It's generally used by larger employers with the financial strength to absorb that risk.Related: Retrospective Rating Plan, Self-Insurance
- Light Duty
- Modified work assigned to an injured employee that accommodates medical restrictions from a treating physician, such as no lifting over a certain weight, while they recover and before they're formally released back to full, unrestricted duty.Related: Return-to-Work Program, Temporary Partial Disability
- Live Certificate
- A certificate of insurance that stays automatically current with the underlying policy, rather than being a static snapshot that can go stale the moment coverage changes. It reflects renewal, cancellation, or other changes without needing a new paper certificate to be reissued.Related: ACORD 25, Certificate of Insurance, Certificate Holder
- Loss Costs
- The portion of a workers' comp rate, published per class code by a rating bureau, that reflects expected claim costs before an insurer adds its own expenses and profit margin. Insurers apply their own loss-cost multiplier on top to arrive at the rate actually charged.Related: NCCI, Rating Bureau, Class Code
- Loss Runs
- A report from a current or prior insurer listing an employer's claims history, including claim dates, amounts paid and reserved, and claim status. Carriers request loss runs to underwrite a new submission and to calculate the experience modification rate.Related: Experience Modification Rate (EMR/Mod), First Report of Injury, Claim Frequency
M
- Maximum Medical Improvement
- The point at which a treating physician determines an injured employee's condition has stabilized and is unlikely to improve further with additional treatment, even if some impairment remains. It's often the trigger for evaluating permanent disability benefits.Related: Permanent Partial Disability, Independent Medical Exam, Return-to-Work Program
- Medical-Only Claim
- A workers' comp claim in which the employee receives medical treatment but doesn't miss enough work to trigger wage-replacement benefits. These claims are typically less costly and weighted differently than indemnity claims in experience rating.Related: Indemnity Claim, Claim Frequency, Split Point
- Misclassification
- Incorrectly treating a worker who functions as an employee as an independent contractor instead, whether intentionally or by mistake. It's a common finding in payroll audits and can result in back premium, penalties, and coverage gaps if that worker is later injured.Related: Independent Contractor, Statutory Employer, Payroll Audit
- Monopolistic State
- A state — currently Ohio, North Dakota, Washington, and Wyoming — where employers must buy workers' comp exclusively through the state's own fund rather than from a private insurer. Because these state policies don't include employers liability coverage, employers there commonly add stop-gap coverage separately.Related: State Fund, Stop-Gap Coverage, Competitive State Fund
N
- NCCI
- The National Council on Compensation Insurance, a rating and statistical organization that develops workers' comp class codes, loss costs, and experience rating rules used in most states. Some states use their own independent rating bureau instead of NCCI.Related: Rating Bureau, Loss Costs, Class Code, Experience Modification Rate (EMR/Mod)
- Non-Renewal
- A decision by either the insurer or the policyholder not to continue a policy into a new term once the current one expires, as distinct from a mid-term cancellation. Insurer-initiated non-renewals usually require advance written notice under state law.Related: Short-Rate Cancellation, Pro-Rata Cancellation
O
- Occupational Disease
- An illness or condition caused by workplace exposure over time, such as a lung condition from years of dust exposure, as opposed to a single traumatic accident. Most states cover occupational disease under workers' comp, often with different filing deadlines than injury claims.Related: Cumulative Trauma, Extraterritorial Coverage
- Officer Exclusion
- A state-permitted option letting a corporate officer remove themselves from workers' comp coverage and premium calculation, usually because they have coverage elsewhere or accept the risk of going uninsured personally. Rules on how many officers can be excluded, and how, vary by state.Related: Payroll Cap (Executive Officer), Sole Proprietor Election
- Other States Insurance (Item 3.C)
- A policy provision that extends workers' comp coverage to states not listed in the policy's main coverage section, used when an employer might unexpectedly send an employee to work in another state. It's meant as a backstop, not a substitute for properly reporting payroll in states where the employer regularly operates.Related: Extraterritorial Coverage, Voluntary Compensation
P
- Part One
- The section of a workers' comp policy that provides the statutory benefits required by state law: medical care, wage-replacement, and death benefits for a covered workplace injury. It has no dollar limit, since it simply pays whatever the state's law requires.Related: Employers Liability (Part Two), Workers' Compensation Insurance, Statutory Employer
- Pay-As-You-Go
- A billing method that calculates workers' comp premium each pay period from actual payroll, usually through integration with payroll software, rather than collecting one large deposit premium upfront and settling the difference at a year-end audit.Related: Deposit Premium, Estimated Payroll, Payroll Audit
- Payroll Audit
- A review, usually conducted after the policy period ends, comparing the payroll and job classifications an employer estimated at the start of the policy to what was actually paid during the year. The final premium is adjusted up or down based on the audit's findings.Related: Estimated Payroll, Audit Noncompliance Charge, Deposit Premium
- Payroll Cap (Executive Officer)
- A state-specific minimum and maximum payroll figure used to rate a corporate officer's workers' comp premium, regardless of their actual salary. It exists so a highly compensated owner isn't rated on their full salary, and so a very low or unpaid officer still generates a minimum premium base.Related: Officer Exclusion, Sole Proprietor Election, Class Code
- PEO
- A Professional Employer Organization that enters a co-employment arrangement with a client business, becoming the employer of record for payroll, benefits, and often workers' comp, while the client company continues directing the employees' day-to-day work.Related: Independent Contractor, Self-Insurance
- Per Diem
- A fixed daily payment sometimes referenced in the context of certain state disability benefit calculations or reimbursement arrangements, as opposed to a rate calculated from actual wages, and occasionally used in describing certain benefit or expense structures.Related: Temporary Total Disability, Waiting Period
- Permanent Partial Disability
- Benefits paid when an injury results in a lasting impairment that doesn't totally prevent the employee from working, calculated under state-specific schedules or ratings tied to the affected body part and degree of impairment that remains after treatment.Related: Permanent Total Disability, Maximum Medical Improvement
- Permanent Total Disability
- Benefits paid when a workplace injury permanently prevents an employee from returning to any gainful employment at all, typically the most significant and longest-lasting benefit level available under a state's workers' comp statute for a covered injury.Related: Permanent Partial Disability, Death Benefits
- Pro-Rata Cancellation
- A cancellation method that refunds the exact unearned portion of premium for the remaining time left on a policy, with no penalty. It's typically used when the insurer cancels a policy or when cancellation is required by circumstances outside the policyholder's control.Related: Short-Rate Cancellation, Non-Renewal
R
- Rating Bureau
- An organization, either NCCI or a state-specific bureau, that collects loss data from insurers, develops class codes and loss costs, and calculates experience modification factors for employers in its state or states. Insurers then build their own rates on top of that shared underlying data.Related: NCCI, Loss Costs, Class Code
- Reserve
- An insurer's estimate, set early in a claim and adjusted over time, of the total amount it expects to eventually pay out on that claim, including medical costs and indemnity benefits. Reserves affect loss runs and experience rating even before a claim is fully resolved.Related: Loss Runs, Claim Severity, Unit Statistical Report
- Residual Market
- The overall system of last-resort coverage, including assigned risk plans, that ensures every employer required to carry workers' comp can obtain a policy even if standard insurers decline to write it voluntarily due to loss history or industry.Related: Assigned Risk Plan, State Fund
- Retroactive Period
- The point at which, if a disability lasts longer than a state's specified threshold, wage-replacement benefits become payable back to the first day of the waiting period rather than only from when the waiting period ended.Related: Waiting Period, Temporary Total Disability
- Retrospective Rating Plan
- A pricing plan in which final premium is adjusted after the policy period based on the employer's actual incurred losses during that period, within a set minimum and maximum, rather than being fixed in advance. It rewards good loss experience with a lower final cost.Related: Self-Insurance, Large Deductible, Dividend Plan
- Return-to-Work Program
- A structured employer program designed to bring an injured employee back to work, often in a light-duty or modified capacity, as soon as medically appropriate. These programs are associated with lower claim costs and shorter claim duration.Related: Light Duty, Temporary Partial Disability, Claim Severity
S
- Safety Group
- A group of employers, typically in the same or similar industries, that combine their workers' comp experience for rating purposes and often participate in shared safety programs, aiming for better pricing than any single member might get alone.Related: Group Self-Insurance, Schedule Credit/Debit
- Schedule Credit/Debit
- An adjustment, usually plus or minus 25%, that an underwriter applies to a policy's premium based on factors not otherwise captured in the rating, such as unusually strong or weak safety practices, newer or older equipment, or the quality of workplace supervision.Related: Experience Modification Rate (EMR/Mod), Premium Discount
- Self-Insurance
- An arrangement in which a business, usually a large one meeting state financial requirements, pays its own workers' comp claims directly instead of buying a traditional insurance policy, taking on the risk itself in exchange for potential cost savings.Related: Group Self-Insurance, Large Deductible, Retrospective Rating Plan
- Short-Rate Cancellation
- A cancellation method, usually applied when the policyholder cancels a policy mid-term by choice, that returns less than the full pro-rata unearned premium as a penalty for canceling early rather than letting the term run its course.Related: Pro-Rata Cancellation, Non-Renewal
- Sole Proprietor Election
- A choice, available in most states, that lets a sole proprietor or partner who isn't otherwise required to carry workers' comp for themselves opt into coverage, usually by naming themselves on the policy and setting a payroll figure the coverage will be based on.Related: Officer Exclusion, Payroll Cap (Executive Officer)
- Split Point
- The dollar threshold, set by the rating bureau and adjusted periodically, that divides each claim into a primary portion (below the split point) and an excess portion (above it) for experience rating purposes, with primary losses weighted more heavily in the mod calculation.Related: Experience Modification Rate (EMR/Mod), Claim Severity, Claim Frequency
- Standard Exception
- A classification, such as clerical office work or outside sales, that can be reported separately from a business's governing class even though it's part of the same operation, because that specific work carries a distinctly lower hazard. Payroll only qualifies when the work is genuinely separated from the higher-hazard operation.Related: Class Code, Governing Class, Dual Wage Classification
- State Fund
- A workers' comp insurer owned or created by a state government. In a monopolistic state it's the only source of coverage; in a competitive state it operates alongside private insurers as one option among several.Related: Monopolistic State, Competitive State Fund, Assigned Risk Plan
- Statutory Employer
- A legal status, common in construction, in which a general contractor can be treated as the 'employer' of an injured subcontractor's worker for workers' comp purposes when that subcontractor didn't carry its own coverage, exposing the general contractor to the claim.Related: Exclusive Remedy, Independent Contractor, Misclassification
- Stop-Gap Coverage
- An endorsement, typically added to a general liability policy, that fills the employers liability gap left by a monopolistic state's workers' comp fund, since those state policies don't include that protection on their own the way a standard private policy would.Related: Monopolistic State, Employers Liability (Part Two), State Fund
- Subrogation
- The insurer's legal right, after paying a workers' comp claim, to pursue a third party who was actually responsible for causing the injury and recover what it paid out. A waiver of subrogation gives up that right for a named party.Related: Waiver of Subrogation, Third-Party-Over Action
T
- Temporary Partial Disability
- Wage-replacement benefits paid when an injured employee can work in some capacity, often light duty or reduced hours, but earns less than before the injury while still recovering, making up part of the wage difference during that period.Related: Temporary Total Disability, Light Duty, Return-to-Work Program
- Temporary Total Disability
- Wage-replacement benefits paid while an injured employee is completely unable to work but is expected to recover enough to eventually return, typically calculated as a percentage of their average weekly wage up to a state maximum.Related: Temporary Partial Disability, Waiting Period, Maximum Medical Improvement
- Third-Party-Over Action
- A lawsuit in which an injured employee, having already received workers' comp benefits, sues a third party (not their employer) they believe caused the injury, such as an equipment manufacturer or another contractor on a jobsite. That third party may then, in turn, try to bring the employer back into the case.Related: Subrogation, Employers Liability (Part Two), Statutory Employer
U
- Unit Statistical Report
- A detailed report an insurer files with the rating bureau summarizing an employer's payroll, premium, and claims for a policy period. It's the underlying data source rating bureaus use to calculate that employer's experience modification rate.Related: Experience Modification Rate (EMR/Mod), ERA (Experience Rating Adjustment), Reserve
- USL&H
- Short for the U.S. Longshore and Harbor Workers' Compensation Act, a federal law providing workers' comp-style benefits to maritime workers such as longshoremen and harbor workers who are injured on navigable waters or in adjoining areas like docks and terminals, separate from state workers' comp systems.Related: Jones Act, Extraterritorial Coverage
V
- Voluntary Compensation
- An endorsement that extends workers' comp-like benefits to workers who aren't legally required to be covered under a state's statute, such as certain excluded officers or out-of-state employees, so they receive comparable protection and the employer retains the exclusive-remedy protection that comes with it.Related: Other States Insurance (Item 3.C), Officer Exclusion, Exclusive Remedy
W
- Waiting Period
- A short span, commonly three to seven days depending on the state, during which an injured employee isn't paid wage-replacement benefits for lost time, though medical benefits typically start immediately. If disability extends beyond a state-set threshold, benefits are often paid retroactively back to day one.Related: Retroactive Period, Temporary Total Disability
- Waiver of Subrogation
- An endorsement in which the insurer gives up its right to recover claim payments from a specific third party, usually because a contract, such as a construction agreement, requires the employer to provide it to a general contractor or property owner.Related: Subrogation, Certificate of Insurance
- Workers' Compensation Insurance
- A statutory form of coverage that pays medical care and partial lost wages for employees injured or made ill on the job, regardless of who was at fault. In exchange, the employee generally gives up the right to sue the employer over the injury. Nearly every state requires it once a business has employees.Related: Workman's Comp, Employers Liability (Part Two), Exclusive Remedy, Class Code
- Workman's Comp
- A common informal name for workers' compensation insurance, used interchangeably with 'workers' comp' and 'work comp' in everyday conversation. It refers to the exact same statutory coverage, not a different or lesser product, and shows up often in casual speech, older documents, and search queries alike.Related: Workers' Compensation Insurance, Employers Liability (Part Two)
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