Insurance Lines Services

This website provides important information about ISO’s insurance lines services.

Here you’ll find:

  • summaries of coming major changes to our rules and forms
  • information about changes scheduled for our next major program revisions
  • lists of items we’re considering for future revisions
  • status reports on major filings

The emphasis will be on what the changes will mean for you and your company. Where available, we’ll provide references to relevant ISO circulars or other publications that give full details of the changes.

The information in this site is for ISO participating insurers. To access the information, you’ll need to enter your ISO Group Number and your NAIC company number. You’ll be able to see information for the lines of insurance for which your company participates. If you don’t know your ISO Group Number, please contact ISO Customer Service 1-800-888-4476, or send e-mail to

Follow the links to the left for information on your line of business.