NCCI Class Code Inspections: What % Actually Change Your Classification
NCCI's Classification Inspection Program examines thousands of contractor payrolls each year. The reclassification rate tells you something about how stable your own codes are.
NCCI's Classification Inspection Program inspects class codes on employer policies through random audits and complaint-driven reviews. Roughly 35% of inspections result in a classification change or code correction (NCCI CIP Summary, 2025). For construction trades, the rate is higher. Roofing, framing, and site prep codes are the most frequent targets. A classification change reassigns payroll and can retroactively affect up to three years of experience rating data.
NCCI runs a Classification Inspection Program (CIP) that examines the class codes assigned to employer policies across all NCCI states. CIP inspectors review payroll records, job descriptions, and actual operations against the Scopes Manual definition for each assigned code. They decide whether the code fits or whether it should change.
The answer matters because the class code determines the rate per $100 of payroll. It also determines the expected loss rate used in the experience rating formula. Two different codes for the same contractor can produce different expected losses, and therefore different mod calculations for the same claim history.
NCCI reports that roughly 35% of CIP inspections result in a class code change (NCCI CIP Summary, 2025). The other 65% confirm that the assigned code is correct. For construction trades, the change rate runs above the average.
Why construction codes get changed more often
Construction classifications have a structural ambiguity that office-based risks don't. A general contractor carries a governing classification code that covers the business as a whole, but the same contractor may self-perform work in a trade with its own code. Payroll allocation between the governing class and the trade-specific class depends on how much of the payroll belongs to each type of work.
When a CIP inspector reviews a general contractor's payroll, they look at whether the allocation matches the actual mix of work performed. If the payroll records show 100% of payroll under the GC code but field operations include significant self-performed carpentry, the inspector reallocates. That reallocation changes not just the premium rate but the expected loss rate for that portion of payroll. The experience rating formula computes expected losses per code. A code with a higher ELR means more expected losses, which means the mod is harder to keep low for the same actual losses.
NCCI's own inspection data shows that roofing (5551), exterior carpentry (5645), and site preparation (5221) are the most frequently inspected construction codes and produce the highest reclassification rates. These are also the codes with the highest loss costs and the widest gap between code definitions and what contractors actually record on their payroll reports.
The three-year retroactive effect
A CIP inspection doesn't just change future coding. When NCCI determines that a different class code was appropriate for past policy periods, the reclassification can reach back three years. The corrected codes apply to each policy period within NCCI's lookback window. The expected losses for those years get recalculated using the corrected code's ELR. The mod for each of those years can shift.
For a contractor whose code was changed from a lower-ELR class to a higher-ELR class, the retroactive recalculation increases expected losses in the formula. Actual losses stay the same. The mod decreases because it is actual divided by expected. A contractor whose code was incorrectly assigned to a higher-ELR class and gets corrected to a lower one sees the opposite effect: expected loss drop, mod goes up, premium increases.
In our reviews of Southeast contractor worksheets, the most common pattern is a GC whose self-performed work was never split into its proper code. The entire payroll sits under the governing class. When a CIP inspection or an internal audit catches it, the correction frequently produces a favorable expected loss adjustment. The contractor overpaid premium and carried a higher mod than their actual loss history justified.
How the Scopes Manual creates audit leverage
Each NCCI class code has a Scopes Manual definition that specifies which operations the code covers and which operations are excluded. The manual is the legal reference for classification decisions. CIP inspectors apply it line by line against payroll records. A contractor's internal classification, assigned at policy issuance by the carrier's underwriter, does not carry the same evidentiary weight. It is an estimate. The Scopes Manual is the standard.
The gap between the estimate and the standard is where classification errors live. In construction, that gap is wider than in most industries because the same contractor can do multiple types of work under a single policy, and carriers typically assign the highest-payroll code as the governing class without reviewing the rest.
What an audit would check
An audit reviews every class code on your policy against the work your crews actually perform, not the payroll allocation your carrier assigned at underwriting. The Scopes Manual definitions for each code are the reference. An audit flags any code where the assigned work description doesn't match what your field operations produce, and it quantifies the expected loss rate difference between the assigned code and the correct code. That difference is the dollar impact on your mod.
If your NCCI worksheet shows a single governing class code for 90% or more of total payroll and you self-perform trades like carpentry, roofing, or concrete work, the allocation is worth reviewing. Send us your NCCI worksheet and we'll review your class codes against the Scopes Manual definitions that apply to your operations.