4.2 Workers Compensation Fundamentals

The Workers Compensation System: No-Fault and Exclusive Remedy

Workers compensation is a no-fault system created by state statute. An injured employee receives benefits regardless of who was at fault — the worker does not have to prove employer negligence, and the employer cannot defend by blaming the worker's carelessness. In exchange, the employee gives up the right to sue the employer in tort. This trade-off is the exclusive remedy doctrine: workers compensation benefits are the sole recourse against the employer for a covered on-the-job injury.

For an injury or illness to be covered it must arise out of and in the course of employment — the AOE/COE test. "Arising out of employment" means the work caused or contributed to the injury; "in the course of employment" means it happened while the employee was performing job duties at the appropriate time and place. An injury during a worker's commute (the going-and-coming rule) is generally not covered, while an injury at the workstation during a shift is.

Workers compensation is statutory, so the policy promises to pay whatever benefits the state law requires rather than a stated dollar limit.

The Four Benefit Types

State workers compensation laws provide four broad categories of benefits:

1. Medical benefits — Pay reasonable and necessary medical care related to the injury. These benefits are typically unlimited with no deductible and no dollar cap, and they begin immediately.
2. Disability income (lost wages) — Replace a portion of lost earnings, usually about two-thirds of average weekly wage subject to state maximums, after a short waiting period. There are four classes:
   • Temporary Total Disability (TTD) — worker cannot work at all but is expected to fully recover.
   • Temporary Partial Disability (TPD) — worker can do some/lighter work during recovery; benefits make up part of the wage difference.
   • Permanent Total Disability (PTD) — worker will never return to gainful employment.
   • Permanent Partial Disability (PPD) — a lasting impairment, often paid by a statutory schedule of benefits by body part after maximum medical improvement (MMI).
3. Death (survivor) benefits — Pay burial expenses up to a statutory cap and ongoing income to surviving dependents.
4. Rehabilitation benefits — Cover vocational rehabilitation and retraining to return the worker to suitable employment.

The Two-Part Policy: Part A and Part B

The standard workers compensation and employers liability policy has two coverage parts.

Part A — Workers Compensation pays all benefits the state statute requires. It has no dollar limit because the insurer agrees to pay whatever the law mandates. This is the no-fault statutory coverage.

Part B — Employers Liability fills the gap when an employee (or a related party) sues the employer for work-related injury outside the exclusive remedy. Examples include third-party-over actions, suits by a spouse for loss of consortium, dual-capacity claims, and consequential bodily injury to a family member. Unlike Part A, Part B carries dollar limits (a common minimum is $100,000 bodily injury by accident / $500,000 policy limit by disease / $100,000 per employee by disease — the "100/500/100" limits).

Experience Modification and the Residual Market

Premium is based on payroll (per $100 of payroll) and the classification of the work. It is then adjusted by the experience modification factor (e-mod or X-mod) — a multiplier built from the employer's own loss history versus expected losses for its class. A mod above 1.00 raises premium (worse-than-average losses); a mod below 1.00 lowers it (better-than-average). The e-mod gives employers a direct financial incentive to improve safety.

Employers that the voluntary market refuses (poor loss history, hazardous class) obtain coverage through the residual market — the assigned-risk plan or state fund — which guarantees that every employer required to carry coverage can get it, usually at higher cost.

Part C and How Premium Is Built

The standard policy also includes Part C — Other States Insurance, which extends coverage to states the employer lists where it may begin operations during the policy term; states where the employer already has known exposure must be listed under Part A. Because Part A pays statutory benefits with no dollar limit, the policy is priced on exposure rather than a face amount.

Premium starts with a manual rate for each job classification applied per $100 of payroll. Clerical staff carry a low rate; roofers and loggers carry a high one, reflecting injury risk. The class premium is then multiplied by the experience modification factor and adjusted by any schedule or premium-discount credits. Because payroll is an estimate at inception, the policy is auditable: at the end of the term the insurer audits actual payroll and bills or refunds the difference.

This payroll-times-rate-times-mod structure is exactly why employers with strong safety programs pay materially less than competitors in the same class — the experience mod converts good loss history directly into lower cost. Employers must keep accurate payroll and classification records, because misclassifying high-hazard workers as clerical is a common audit finding that produces a large additional premium bill after the year-end audit.