The short version. A high mod is a three-year story about how often an insured gets hurt, more than how badly. Before you shop the account: (1) audit the mod worksheet for errors, (2) build the "what changed" story underwriters need, and (3) know which market fits — a standard carrier with a debit, a specialty high-mod market, a deductible or pay-as-you-go program, or, as a last resort, the residual market.
What the experience mod actually measures
The experience modification factor ("mod") is the number a workers' comp premium is multiplied by to reflect the insured's own loss history[2]. NCCI builds it by comparing the employer's actual losses with the losses expected for businesses of the same classifications and size[1]. A 1.00 is average. Above 1.00 is a debit; below is a credit.
Three details drive almost every high-mod conversation:
- It looks back about three years — and skips the year that just ended. NCCI's experience period is typically three years of payroll and losses, drawn from policies that started roughly 21 to 57 months before the rating date; the policy that just ended is left out because its losses aren't fully reported yet[1]. A bad year hurts the mod for three renewals, and this year's improvements won't show up until later. That lag is why the "what changed" story matters so much.
- Frequency outweighs severity. Each claim is split into a primary part (up to the "split point") and an excess part. The plan gives more weight to the primary part because how often injuries happen is more predictable than how much each one costs[1]. Four small claims can move a mod more than one large claim.
- Medical-only claims are discounted. Under the Experience Rating Adjustment (ERA) in states that use it, only 30% of a medical-only claim counts in the mod — a 70% reduction[1]. A medical-only claim miscoded as a lost-time claim is a costly error.
The split point is set by state and has moved in recent years. In Louisiana, for example, it rose from $18,500 to $38,000 for mods effective May 1, 2024. NCCI designed that change to be premium-neutral overall, but individual mods still shifted — credit mods tended to get slightly larger credits and debit mods slightly larger debits[3]. If an insured's mod jumped without a matching jump in claims, check whether a split-point change is part of the reason.
Step 1: Audit the worksheet before you shop it
A mod is only as accurate as the payroll, class codes and claim values reported to the rating bureau. Errors are common enough that a worksheet review should come before any marketing. Pull the current worksheet and the carrier loss runs for the same years, and check:
| Check | What to look for |
|---|---|
| Class codes | Do the codes on the worksheet match what the insured actually does? A wrong code changes the expected losses the mod is measured against. |
| Payroll by class | Does reported payroll match the final audits for each year? Expected losses scale with payroll. |
| Open claim reserves | Are open claims reserved realistically? Ask the carrier to review stale or high reserves before the next valuation. |
| Closed claims | Are claims that closed below their reserve shown at the final paid value? |
| Medical-only coding | Is every medical-only claim coded as medical-only so the ERA discount applies[1]? |
| Ownership and entities | Did ownership change, or are entities combined that shouldn't be? Ownership changes are reported to NCCI on the ERM-14 form so the bureau can decide how experience transfers and whether entities combine[4]. |
If you find an error, ask the carrier that reported the data to correct it with the rating bureau, then request a revised worksheet. A corrected mod is the cheapest premium reduction there is.
Step 2: Build the story underwriters need
Underwriters price the future, but the mod only shows the past — and not even the most recent year. Your job is to close that gap with facts. A strong high-mod submission answers four questions:
- What happened? A one-line explanation for every claim that drove the mod, especially the large ones.
- What changed since? New safety program, new supervisor, a written return-to-work program, an operation the insured stopped doing, equipment replaced.
- What does the current year look like? Current loss runs show the trend the mod hasn't caught yet.
- Is it frequency or severity? Because the mod weighs frequency more heavily[1], show claim counts by year. A falling count is the strongest evidence you have.
Back each answer with a document — the safety manual, training logs, the return-to-work policy. Claims without proof read as sales talk.
Step 3: Match the account to the right market
| Option | When it fits | Watch out for |
|---|---|---|
| Standard carrier, with a schedule debit | Mod modestly above 1.00 with a clear improvement story | Appetite tightens quickly as the mod climbs; get the story in front of the underwriter early |
| Specialty and wholesale high-mod markets | Mod well above average, or a carrier non-renewal | Many markets list high-mod appetite on wholesale directories[7]; compare payment terms and loss-control requirements, not just price |
| Deductible or pay-as-you-go programs | Insureds with the cash flow to share small-claim costs | Collateral and deductible reimbursement terms; make sure the insured understands them |
| Competitive state fund | In states that have one | Available in some states only — in about 13 states the competitive fund also serves as the market of last resort[5] |
| Residual market (assigned risk) | Last resort when voluntary carriers decline | Basic, no-frills coverage with fewer endorsement options[5]; typically requires declinations first — Tennessee, for example, requires rejection by two or more non-affiliated insurers[6] |
The residual market guarantees access — every state makes coverage available to employers required to carry it[5] — so treat it as the floor, not the plan. NCCI administers residual market plans in many states[5][6]. Placing an account there can buy a year to let the mod improve, but plan the path back to the voluntary market from day one.
Example: a landscaping account with a rising mod
This is an illustrative example, not a real account. A landscaping contractor's mod has climbed over three renewals and its carrier is non-renewing. The loss runs show several small claims in one year — strains and cuts — and no large claims. The agent's review finds two of those claims were medical-only but coded as lost-time, so the ERA discount never applied. After the carrier corrects the coding, the revised worksheet comes in lower. The agent then submits the account to a specialty market with the corrected mod, the claim explanations, proof of a new crew-leader safety training program, and current-year loss runs showing fewer claims. The account is placed in the voluntary market instead of assigned risk.
The lesson: in a frequency-driven mod, the fix is usually a combination of cleaning up the data and proving the frequency trend has turned.
Explaining the mod to your insured
Most business owners see the mod as a penalty that arrives out of nowhere. A five-minute explanation changes that, and it makes them partners in fixing it:
- It's a multiplier. Their premium is the standard premium times the mod[2]. A 1.25 means paying about a quarter more than an average business of the same type and size; a 0.85 means paying less.
- It compares them with their peers. The mod measures their losses against what's expected for businesses in the same classifications[1], so it's not a judgment on the industry — it's their own record.
- How often matters more than how much. Because frequency carries more weight[1], preventing the everyday strains, slips and cuts does more for the mod than anything else.
- Report every claim. Because medical-only claims are discounted in the mod (see the ERA above), prompt reporting usually beats paying small claims out of pocket — and quietly handling claims can create its own problems if a "small" injury turns into a large one.
- It lags. Today's improvements show up in future mods, not next month's[1]. Set that expectation early so the insured doesn't give up on a safety program after one renewal.
Planning next year's mod now
The best time to fix a high mod is a year before the renewal that hurts. A few habits keep you ahead of it:
- Ask for the worksheet early. Mods are often available before renewal, though timing varies. Reviewing it 60 to 90 days out leaves time to correct errors before quotes go out.
- Review open reserves before the valuation date. Open claims are counted at their reserve. Ask the carrier's adjuster whether reserves on aging claims still reflect reality.
- Track claim counts quarterly, not just dollars. A rising count is the early warning for a rising mod.
- Watch for rule changes. Split-point and rating-plan changes can move a mod even when claims don't change[3]. When a mod jumps unexpectedly, ask the bureau or carrier whether a plan change is part of it.
High-mod submission checklist
- Current experience rating worksheet, plus the prior year's for comparison
- Three to five years of currently valued loss runs
- A one-line explanation for each significant claim
- Claim counts by policy year (to show the frequency trend)
- Written safety program, training records, and return-to-work policy
- Payroll by class code, matched to the latest audit
- Any ownership-change details (ERM-14) if ownership changed[4]
- Completed ACORD 130 application
Frequently asked questions
What counts as a high experience mod?
A mod above 1.00 means the insured's losses were worse than expected for similar businesses, so premium is surcharged. How high is "too high" depends on the carrier: appetite usually narrows as the mod rises, and the account story matters as much as the number.
How long does a bad year stay in the mod?
Typically three ratings. NCCI's experience period is generally three years of data and leaves out the policy year that just ended, because its losses aren't fully reported yet. A bad year enters the mod after a lag and then stays for about three renewals.
Why did the mod go up when the insured had fewer claim dollars?
The mod weighs claim frequency more than severity, so several small claims can outweigh one large claim. Split-point changes and corrections to payroll or class codes can also move a mod without any change in claims.
Does a high mod mean the account has to go to assigned risk?
No. Standard carriers, specialty high-mod markets, deductible programs and competitive state funds are all options before the residual market, which is the last resort when voluntary carriers decline.
Sources
- ABCs of Experience Rating — National Council on Compensation Insurance (NCCI), 2021. Accessed October 7, 2026.
- Modification Factor (definition) — IRMI. Accessed October 7, 2026.
- Understanding Upcoming E-Mod Changes — LWCC, August 3, 2023. Accessed October 7, 2026.
- ERM-14 Form Instructions (Confidential Request for Ownership Information) — NCCI, 2018. Accessed October 7, 2026.
- Navigating the Workers Compensation Residual Market — IRMI (Christine Fuge), October 17, 2024. Accessed October 7, 2026.
- How To Buy WC Insurance and How To Access The Tennessee Residual Market — Tennessee Department of Commerce & Insurance. Accessed October 7, 2026.
- High Mod Workers Comp Insurance — Storefronts — CompleteMarkets. Accessed October 7, 2026.