| Circular Letter # | Date | Description | Effective Date | 
        
            | 2384 | 04/12/2021 | Adoption of the national classification phraseology and scope, drafted by the NCCI, for Code 5606 – Contractor — Project Manager, Construction Executive, Construction Manager, or Construction Superintendent | 04/01/2021 | 
        
            | 2331 | 03/29/2018 | The SCOPES for certain Classification Codes have been updated to clearly describe all operations that are common to all insureds involved in certain types of steel erection projects. | 07/01/2018 | 
        
            | 2310 | 03/03/2017 | Merger of Certain Classifications that are Currently Combined for Ratemaking and Elimination or Re-Assignment of Certain Low Credibility Classifications to Other Similar Classifications | 05/01/2017 | 
        
            | 2277 | 03/30/2016 | Admiralty and Federal Employer's Liability Act - Class Rate Revisions | 07/01/2016 | 
        
            | 2270 | 12/02/2015 | Establishment of Specific Classifications for Casino Gambling Operations | 02/01/2016 | 
        
            | 2232 | 01/31/2014 | Elimination of the Passenger Seat Surcharge - Code 0088 | 01/01/2015 | 
        
            | 2243 | 08/12/2014 | Consolidation of Selected Explosives Manufacturing Codes | 10/01/2014 | 
        
            | 2212 | 12/19/2012 | Elimination of Inactive "A" Rated Classifications | 03/01/2013 | 
        
            | 2188 | 11/14/2011 | Creation of two new and distinct classifications for assisted living residences - Codes 8824 and 8826. | 04/01/2012 | 
        
            | 2128 | 09/10/2009 | Elimination of all "Z" designated classification codes. | 09/01/2009 | 
        
            | 2074 | 11/01/2007 | Changes in classifications for the aviation industry to reflect current business and industry needs. | 01/01/2008 | 
        
            | 2029 | 09/18/2006 | Approval of Rural Utilities Service Endorsement WC 00 03 09 B & Elimination of Classification Code 7540z and Re-assignment of such Rural Electrification Projects to Code 7539 | 09/15/2006 | 
        
            | 1961 | 07/09/2004 | Establishment of Code 8747 - Display Showrooms - All Types 07/01/04 | 07/01/2004 | 
        
            | 1892 | 05/23/2002 | Elimination of Code 9529 A-rated classification and establishment of a new, manually rated class Code 9533 | 06/01/2002 | 
        
            | 1891 | 04/29/2002 | Workers Compensation Classification Guide - Specialty Concrete Pumpers - classification by analogy to class Code 9534 | 05/01/2002 | 
        
            | 1882 | 08/30/2001 | Establishment of specific classification phraseologies for social service agencies: Day Habilitation Programs & Staffed Residential Programs - under Codes 8868 and 9101 | 04/18/2001 | 
        
            | 1860 | 12/04/2000 | Codes 7403, 7405, 7423 and 7431 - Air Carriers classifications - amended phraseologies | 12/01/2000 | 
        
            | 1824 | 07/13/1999 | Domestic Workers - Inside - Physical Assistance - Code 0918 | 07/15/1999 | 
        
            | 1813 | 04/06/1999 | Carpet, Linoleum, Vinyl, Asphalt or Rubber Floor Tile Installation - Code 5478 | 04/01/1999 | 
        
            | 1801 | 08/18/1998 | Fence Erection - All Types - Code 6400 | 08/01/1998 | 
        
            | 1783 | 08/11/1997 | Fertilizer or Pesticide Application - Commercial or Domestic & Drivers - Code 0046 | 08/15/1997 | 
        
            | 1775 | 01/21/1997 | Elimination of Chemical and Dyestuff Rating Plan (CDRP) - Establishment of two replacement classifications - Codes 4828 and 4829 | 02/01/1997 | 
        
            | 1766 | 10/25/1996 | Revisions to Explanatory Information - Classification Code 8829 - Convalescent or Nursing Home - All Employees / Nursing or Convalescent Home - All Employees. Introduction of Cross-Reference Classification Phraseology - Rest Homes: Professional Employees - Code 8833 / All Other Employees - Code 9040 | 10/01/1996 01/01/1997 | 
        
            | 1762 | 09/30/1996 | Claim Adjusters or Insurance Company Special Agents - Traveling - Code 8742 | 10/01/1996 | 
        
            | 1717 | 04/06/1995 | Real Estate Appraisal Company - Outside Employees - Code 8721 | 04/15/1995 | 
        
            | 1650 | 09/03/1993 | Introduction of New Phraseology - Tubular Metal Products Mfg. or Assembly - Code 3841 Elimination of Code 3865 - Baby Carriage Mfg. Merging of Code 3865 into Code 3841 | 09/01/1993 | 
        
            | 1637 | 06/07/1993 | Revision of Classification Phraseology Code No. 4273 - Bag Mfg. - Paper to: Bag Mfg. - Paper and Plastic | 06/01/1993 | 
        
            | 1635 | 05/18/1993 | Biomedical Research laboratories | 05/15/1993 | 
        
            | 1628 | 03/03/1993 | Item B-1280: Asbestos Removal Operations | 03/01/1993 | 
        
            | 1603 | 04/23/1992 | Box or Box Shook Mfg. | 01/01/1992 | 
        
            | 1600 | 03/31/1992 | Beer or Ale Dealers - Wholesale & Drivers | 12/23/1991 |