NOC stands for Not Otherwise Classified. If you see this on a Workers Comp policy or premium audit, it means that the Classification Code is non-specific. This means that the underwriter or premium auditor could not place your business in any other Classification Codes other than the more general ones.
It is advisable that you look further into this general type classifying of your business.  You may find other classification codes that would describe your business more accurately.
For instance, Store Employees, NOC means that the classification of your employees could not be associated with a more specific code. This is one of the most common mistakes that we see on policies and audits by the insurance carriers. These Class Codes are much more expensive as the NOC Classification Codes are seen as riskier. The more specific Class Codes can be a more accurate assessment of the employees covered in the policy.
If you receive a policy or premium audit with Not Otherwise Classified on it, there could possibly be a more specific Class Code. The previous example could be more specific by using the Store: Clothing or Wearing Apparel Classification Code. This type of Class Code will always be less expensive than the Not Otherwise Classified Code.