Workers' Comp Class Codes Explained: How Classification Works and Where to Look Codes Up

8/21/2026

Every dollar of workers' compensation premium starts with a class code. The code determines the rate per $100 of payroll, the expected losses your experience mod is measured against, and what the premium auditor will test when the policy year ends. Get the code wrong and every downstream number is wrong with it, often for years before anyone notices.

Most guidance on class codes is a lookup table. This article is about the system behind the table: what a code actually classifies, why the business is coded rather than the job title, how standard exceptions like clerical and outside sales work, why the codes differ in California, Pennsylvania and a handful of other states, and where to look a code up without relying on a third-party list.

What a Class Code Is

A workers' comp classification is a grouping of employers whose operations carry similar injury exposure. The rate for that classification reflects the combined loss experience of every employer in the group. Codes are four-digit numbers in most states (for example, 8810 for clerical office employees in NCCI states) paired with a written description called the phraseology, plus footnotes and cross-references that say what the code includes and excludes.

The rate attached to a code is set by state filing, not by the employer. What the employer controls is the assignment of operations and payroll to codes. That is why classification review is one of the few genuinely controllable parts of workers' comp cost, and why misclassification is one of the most common premium audit findings in both directions.

The Business Is Classified, Not the Job

The single most important rule in classification is also the least intuitive one for HR and payroll staff used to job titles.

In NCCI-format manuals, the stated objective is to group employers with similar operations, and it is the business of the employer within a state that is classified, not the separate employments, occupations or operations within it. The North Carolina Rate Bureau's Basic Manual, which follows the NCCI format, says this in nearly those words.

So a roofing contractor's warehouse worker, estimator's assistant and yard driver are generally not given their own codes. They fall under the roofing classification, because the classification describes the whole business and its rate was built from the losses of businesses that employ those same supporting roles. Coding each person by job description would undercount the business's real exposure.

This is the starting point for every classification question: what does the business do, in this state? Only after that is answered do the exceptions come into play.

Basic Classifications and the Governing Class

A basic classification describes a type of business: a manufacturer of a particular product, a construction trade, a service, a mercantile operation and so on. Most employers have one basic classification, and all of their employees fall under it except those who qualify for a standard exception.

Some employers have more than one basic classification. NCCI-format rules allow multiple basic classifications in specific situations, including certain construction, farming, mercantile and employee leasing operations, and where an employer runs genuinely separate operations in the same state. For separate operations the conditions are strict: they generally must be able to exist as independent businesses, be physically separated, and be supported by separate records.

When more than one basic classification applies, one of them is the governing classification. It is the basic classification, other than a standard exception, that produces the greatest amount of payroll at the location or job. The governing class matters because it is the class used for miscellaneous employees, local managers and executive officers who are not otherwise assigned.

Standard Exceptions: Clerical, Outside Sales and Drivers

Some occupations are common to almost every business and carry very different exposure from the business's core operations. Those are handled by standard exception classifications, which are coded separately unless the basic classification's own wording includes them.

In NCCI-format manuals, the standard exceptions include:

Code	Description
8810	Clerical Office Employees NOC
8871	Clerical Telecommuter Employees
7380	Drivers, Chauffeurs, Messengers and Their Helpers NOC (Commercial)
8742	Salespersons or Collectors (Outside)
8748	Automobile Salespersons

Two rules govern how these work in practice.

The exception only applies if the basic classification does not already include the role. Some phraseologies expressly include clerical or sales exposure. NCCI's classification inspection research gives the example of Code 9012 (building operation by owner or lessee), whose phraseology includes clerical and salesperson exposure, so NCCI's rules prohibit splitting that payroll out to 8810 or 8742. NCCI reports that a large share of the 9012 risks it reclassified had placed most of their payroll in 8810, 8742 or both.

The duties must actually match the exception. For 8810, NCCI-format rules require the work to be clerical in nature and generally performed in a clerical work area separated from operations. A shop office where the supervisor also runs equipment, or a "clerical" employee who regularly works on the floor, does not qualify. This is the standard exception most often challenged at audit, because shifting payroll from a high-rated operating class into 8810 has a large effect on premium.

"NOC" in a code title means "not otherwise classified": the code applies only if no other classification more specifically describes the business or role.

General Inclusions and General Exclusions

Two more rule groups decide what sits inside or outside the basic classification.

General inclusions are operations that look like separate businesses but are included in the basic classification anyway. In NCCI-format manuals they include employee cafeterias and restaurants, making containers for the employer's own products, medical facilities for employees, maintenance and repair of the employer's own buildings and equipment by its own employees, and printing for the employer's own use. They are not coded separately (with limited exceptions for construction, lumbering and mining operations).

General exclusions are operations so different from the business that they are separately classified even when they are not a separate business. NCCI-format lists include aviation (ground and flight crews), new construction or alterations, stevedoring and sawmill operations. A manufacturer whose employees build an addition to the plant does not put that payroll in the manufacturing code.

Dividing One Employee's Payroll Between Codes

What about the employee who genuinely works in two classifications, such as a construction worker who performs two trades?

NCCI-format rules allow an individual employee's payroll to be divided among classifications only in limited situations and only when the employer keeps proper records showing the payroll for each. In construction and certain other operations, the rule is explicit: without separate records, the payroll goes to the highest-rated classification that applies.

That is a payroll system requirement, not an insurance technicality. If your timekeeping cannot show hours by type of work, the auditor will default to the most expensive code. A labor-distribution field in timekeeping, mapped to class codes, is what makes payroll division defensible.

NCCI States vs. Independent Bureau States

NCCI is the rating and statistical organization for most states, but not all. Classification rules and even code numbers differ in the states with independent bureaus.

Type of state	Who sets classifications	Notes
NCCI states	NCCI's Basic Manual and Scopes	Roughly 40 jurisdictions; state-specific exceptions apply
Independent bureau states	State rating bureau	California, Delaware, Indiana, Massachusetts, Michigan, Minnesota, New Jersey, New York, North Carolina, Pennsylvania, Wisconsin
Monopolistic states	State fund	North Dakota, Ohio, Washington, Wyoming

The differences between bureau states are not uniform:

Some bureaus use NCCI-format codes and rules with state modifications. North Carolina's Rate Bureau publishes a Basic Manual that follows the NCCI structure, including the same standard exception codes.
Some use substantially different systems. California's WCIRB maintains its own Standard Classification System. Pennsylvania and Delaware use three-digit codes that do not map one-to-one to NCCI's four-digit numbers; clerical office employees are Code 953 in Pennsylvania rather than 8810.
Monopolistic states classify under their own systems. Washington, for example, uses its own risk classes and bases most premium on hours worked rather than payroll.

Two practical consequences for multi-state employers:

The same employee group can carry different codes in different states. Do not copy the class code from one state's policy into another state's payroll setup without checking.
A code number is meaningless without its state. "8810" is not universal, and a lookup tool built on NCCI codes will mislead you in Pennsylvania or California.

How to Look Up a Workers' Comp Class Code

Start from authoritative sources, in this order.

Your own policy. Item 4 of the policy's information page lists the classifications, premium basis and rates the carrier assigned. Those codes are the starting point, not the final word; the standard policy says that if your actual exposures are not properly described, the carrier will assign proper classifications by endorsement.
The rating bureau for the state.

NCCI states: NCCI publishes the Basic Manual and the Scopes of Basic Manual Classifications, which contain the detailed scope of each code. NCCI's full classification tools are generally subscription products used by carriers and agents, so employers usually work through their agent.
California: WCIRB offers a Classification Search on its website, which lets users search phraseologies, footnotes and rules by keyword or by code number.
Other bureau states: Each bureau publishes its manual. Pennsylvania's PCRB and Delaware's DCRB publish their manuals of rules, classifications and rating values; New York's NYCIRB, New Jersey's CRIB and others publish their own materials.
Monopolistic states: the state fund publishes its classification manual and rates.

The scope, not just the title. A code's short title is a label. The scope or phraseology, its footnotes and its cross-references decide whether it fits. Two codes with similar titles can carry very different rates.
Your agent and carrier for anything ambiguous. Ask for the classification rationale in writing. If you disagree, ask the carrier how to dispute it; disputes generally start with the carrier and can be escalated to the rating bureau or the state insurance regulator, under procedures that vary by state.

Third-party "class code lookup" sites can be useful for orientation, but they are not the manual. Rates and scopes are filed and change; a static list is often out of date or built for NCCI states only.

Where Classification Goes Wrong

The recurring problems are predictable, which makes them preventable.

Clerical overreach. Employees placed in 8810 who do not meet the clerical requirements, or 8810 used where the governing class already includes clerical work. This is the most common audit reclassification.

Outside sales that is not outside. 8742 is for salespeople who work away from the premises. A salesperson who also delivers, installs or works the counter usually belongs in the governing class.

Code assigned at inception and never revisited. A business that has added a product line, a service or a construction arm may now need a different governing class or an additional basic classification.

Payroll not split by records. Construction employers who cannot show hours by trade lose the right to divide payroll and pay at the highest rate.

Codes copied across states. A multi-state employer applying NCCI codes in Pennsylvania or California.

Miscoding in both directions. Over-classification wastes premium every year until someone looks. Under-classification looks like savings until the audit, when the carrier assesses the difference for the whole policy year, and repeated or deliberate misclassification can become premium fraud. Our post on workers' comp fraud red flags covers the employer side of that risk.

What Payroll Should Own

Class codes are usually chosen by the agent and carrier, but the data that supports them lives in payroll and HR. A sound setup includes:

A class code field on every employee record, by state, reviewed when a job changes
A labor-distribution field in timekeeping where payroll division is permitted, with records that would satisfy an auditor
Separate earnings codes for overtime premium, so the excludable portion can be documented where the state's rules allow it
An annual review of job duties against the codes in use, particularly anyone in 8810 or 8742
Certificates of insurance on file for every subcontractor, because uninsured subcontractor payroll can be added to your premium basis

The premium effect of a single misclassified group is easy to underestimate. Our guide on how to calculate workers' comp premiums works through an example where one classification error changes annual premium by tens of thousands of dollars. For the broader picture, see our Workers' Compensation 101 guide for payroll professionals and the payroll department checklist for workers' comp.

Classification also feeds the experience mod: expected losses are calculated from payroll by class, so payroll in the wrong class distorts the benchmark your actual losses are measured against. The Workers' Comp Premium Control: Experience Mods, Classifications and Audit Mastery program covers classification together with experience mods and audit, the three places where payroll data turns into premium.

Frequently Asked Questions

What is the most common workers' comp class code?

Code 8810, Clerical Office Employees NOC, is used by a very large number of employers in NCCI states because almost every business has office staff who may qualify as a standard exception. It also has one of the lowest rates, which is why it is so often misapplied. To qualify, the work must be genuinely clerical and generally performed in a separate clerical area, and the business's basic classification must not already include clerical work. Note that 8810 is an NCCI-format code; Pennsylvania and Delaware use Code 953, and California's system has its own rules.

Can one employee have two class codes?

Sometimes. NCCI-format manuals allow an individual employee's payroll to be divided among classifications only in limited circumstances and only when the employer keeps proper records showing the payroll for each type of work. In construction and certain other operations, if those records do not exist, the entire payroll goes to the highest-rated classification that applies. A standard exception cannot be combined with operational duties: an employee who does both clerical work and shop work is not partly 8810.

How do I find the NCCI class code for my business?

Start with the classifications listed in Item 4 of your policy's information page, then check the scope of each code in NCCI's Scopes of Basic Manual Classifications. Because NCCI's detailed classification tools are typically subscription products, most employers work through their agent or carrier for the formal determination. Ask for the reasoning in writing. Remember that NCCI codes apply only in NCCI states; if you operate in California, Pennsylvania, New York or another bureau state, use that bureau's manual.

What is the difference between NCCI and WCIRB class codes?

NCCI publishes classification rules and codes used in most states. WCIRB is California's rating bureau and maintains California's own Standard Classification System, with its own rules, phraseologies and code assignments. Some code numbers look similar, but definitions, scopes and rules can differ, so an NCCI code cannot simply be carried into California. WCIRB's website offers a Classification Search that lets you look up California classifications by keyword or code number, including footnotes and related rules.

Who decides my workers' comp class code?

The insurance carrier assigns classifications on the policy, applying the rating bureau's or state fund's manual to your operations. The employer supplies the description of operations and payroll by type of work, and the agent usually prepares that submission. The carrier can reassign codes at audit or after an inspection, and bureaus such as NCCI also inspect employers to verify classification. If you disagree with a code, ask the carrier for its basis and use the state's classification dispute process if needed.

What happens if my class code is wrong?

If the code is too low, the premium audit at year end will usually reassign the payroll and bill the difference for the full policy period, and future policies will be corrected. Persistent or deliberate misclassification can be treated as premium fraud under state law. If the code is too high, you have been overpaying, and whether past premium can be recovered depends on the carrier's rules and your state; corrections going forward are more straightforward. Either way, review the codes every year rather than waiting for the auditor.

Train the People Who Own the Data

Classification decisions are made by carriers, but the evidence that supports them, from job duties to labor distribution records, is produced by payroll and HR. Teams that understand the rules catch errors before an audit does. The Workers' Comp Premium Control: Experience Mods, Classifications and Audit Mastery program covers classification, experience mods and premium audit together. For state rules, see our state pages, including bureau states such as California, Pennsylvania and New York, and our workers' comp FAQs.