Medical Inflation Cools to 1.0%, But One Severe Claim Still Drives Your Mod
NCCI's WCWMI fell to 1.0% in June 2026, but the index is expected to climb back toward 2.0% to 2.5%. For construction contractors, one severe lost-time claim still dominates the mod regardless of aggregate price relief.
NCCI's Workers' Compensation Medical Inflation Index (WCWMI) dropped to 1.0% in June 2026 (NCCI, July 2026), the lowest reading in years. But NCCI expects the index to drift back toward 2.0% to 2.5% (NCCI Medical Inflation Insights, 2026). For construction contractors, aggregate medical price relief does not protect a mod from a single severe lost-time claim. One $75,000 claim flowing through primary and excess loss thresholds can move a construction mod 8 to 12 points regardless of what the m.
NCCI (the National Council on Compensation Insurance) reported that its Workers' Compensation Medical Inflation Index fell to 1.0% in June 2026 (NCCI, July 2026). That is the lowest year-over-year medical price growth the index has recorded in years. By any macroeconomic standard, 1.0% medical inflation is remarkable restraint.
But NCCI's own commentary tempers the celebration. The index is expected to drift back toward 2.0% to 2.5% over the coming quarters (NCCI Medical Inflation Insights, 2026). The cooling is real. It is also temporary.
For a construction CFO or safety director planning a 2027 renewal, the headline number creates a false impression. Aggregate medical inflation cooling to 1.0% sounds like cost relief. It is not relief for your experience modification rate, because the mod does not respond to aggregate trends. It responds to individual claims.
Why the WCWMI does not move your mod
The WCWMI tracks medical price changes across the entire workers' comp system. It measures what hospitals, physicians, and pharmacies charge per procedure, indexed over time. When the index drops, carriers pay less per claim on average. That affects filed loss costs and base rates over time.
Your mod is a different mechanism. It compares your actual losses to expected losses for a contractor of your size and trade. The expected loss side is set by NCCI's Expected Loss Rate for your classification. The actual loss side is driven by what happened to your people. A 1.0% medical inflation index does not change the fact that a single severe claim landed on your worksheet.
This is the disconnect. Aggregate medical prices can flatten or decline while your individual loss experience worsens. The mod does not average your experience with the rest of the market. It holds you accountable for your own claims.
One $75,000 claim and the primary-excess threshold
Consider a $75,000 lost-time claim on a construction worksheet. In NCCI's experience rating plan, each claim splits into a primary portion and an excess portion at the split point. For 2026, the split point is $18,500 (NCCI, January 2026). The first $18,500 of that claim hits the primary side at full weight. The remaining $56,500 hits the excess side at a discounted weight determined by your Expected Loss Rate.
The primary side is where severity bites hardest. Primary losses enter the mod calculation at 100% weight. A single $75,000 claim contributes $18,500 to primary losses. That is the same primary contribution as roughly four smaller $4,625 claims. One severe injury can do the work of several minor ones in the mod formula, and the 1.0% medical inflation reading does nothing to soften that impact.
If that $75,000 claim should have closed at $30,000 but an open reserve kept it inflated, the excess portion carries $45,000 of overstated losses into your mod. That kind of reserve drift can move a construction mod 8 to 12 points depending on payroll size and classification mix. Use the EMR calculator to see what that delta costs at your premium level.
What NCCI's inflation forecast means for 2027 renewals
NCCI expects medical inflation to return toward 2.0% to 2.5% (NCCI Medical Inflation Insights, 2026). That forecast matters for filed loss costs in 2027, which carriers use to set base rates. If medical prices climb back, filed loss costs rise and the expected loss side of your mod rises with them.
But the expected loss increase is gradual. It affects all contractors in your classification equally. A severe claim on your worksheet is specific to you. It hits the actual loss side of the mod at full primary weight. No aggregate index offsets it.
In our reviews of Southeast contractor worksheets, the most common pattern is a single severe claim doing disproportionate mod damage while the contractor waits for medical inflation to provide relief. The relief never comes from that direction. It comes from closing the claim, correcting the reserve, or aging out of the experience period.
What an audit would check
An audit checks whether that severe claim's reserve on your worksheet matches the carrier's current actual reserve. It checks whether the claim is still open when the medical records suggest it should have closed. It checks whether the classification assigned to the injured worker's payroll aligns with the work actually performed, because misclassification can distort the expected loss calculation. Most contractors carrying a severe claim into 2027 renewal have at least one of these issues sitting in their worksheet.
Send us your NCCI worksheet before your 2027 renewal and we will review it for free.