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📈 '''Experience modification''' is a [[Definition:Rate-making | rating]] mechanism used in insurance — most prominently in [[Definition:Workers' compensation insurance | workers' compensation]] — that adjusts a policyholder's [[Definition:Premium | premium]] up or down based on how their actual [[Definition:Loss | loss]] history compares to the expected losses for similarly situated risks. Often expressed as an "experience mod" or "e-mod factor," it functions as a multiplier applied to the [[Definition:Manual rate | manual rate]], rewarding employers with better-than-average [[Definition:Claim | claims]] experience and surcharging those whose losses exceed the norm.

⚙️ The calculation begins with [[Definition:Experience data | experience data]] — typically spanning the three most recent completed policy years, excluding the current term — submitted to a rating bureau such as the [[Definition:National Council on Compensation Insurance (NCCI) | NCCI]] or a state-level equivalent. The bureau compares the insured's actual losses against expected losses derived from [[Definition:Classification code | classification codes]] and [[Definition:Payroll | payroll]] figures. A modifier of 1.00 means the insured's experience exactly matches the class average; a figure below 1.00 translates into a premium credit, while anything above 1.00 results in a debit. The formula weights frequency of claims more heavily than severity, reflecting the actuarial principle that frequent small losses are a stronger predictor of future risk than a single catastrophic event.

🏢 For employers, the experience modification factor carries real financial consequences that extend well beyond the insurance bill. A high mod can increase annual premiums by tens or even hundreds of thousands of dollars, while also signaling to prospective clients, contractors, and regulators that a firm's safety record is subpar. Many general contractors, for example, require subcontractors to carry an e-mod at or below 1.00 to qualify for project bids. This makes active [[Definition:Loss control | loss control]] programs and timely [[Definition:Claims management | claims management]] strategically important — they directly influence the data that feeds the modification formula and, by extension, the company's competitive position and [[Definition:Total cost of risk | total cost of risk]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Experience data]]
* [[Definition:Workers' compensation insurance]]
* [[Definition:Manual rate]]
* [[Definition:Loss control]]
* [[Definition:Classification code]]
* [[Definition:National Council on Compensation Insurance (NCCI)]]
{{Div col end}}

Definition:Experience modification - Revision history

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