Site Closures:

Due to natural disasters in the United States, India, and the Caribbean islands, we are experiencing site closures in some areas. We are working diligently to contact all affected candidates by email and phone. If you have questions about your appointment, please contact customer service. We appreciate your patience.

Customer Service

Important Information

ICC has been split into different testing programs on our website. You will need to know the two digit exam code before you can register for your National Certification and UST/AST exam. Each testing program will require a unique username and password. View the current exams list for the National Certification and UST/AST program.

Global chat

Chat is the quickest way to reach a customer service agent.

Click on the Chat icon to get started.


If chat is “offline,” click on your region below for telephone numbers and office hours.

Telephone and email addresses broken down by region

Office Hours

Monday–Friday, 7:00 a.m.–10:00 p.m. CT, Saturday, 7:00 a.m.–4:00 p.m. CT, and Sunday, 9:00 a.m.–3:00 p.m. CT; closed on local holidays.

Telephone

  • 800-275-8301 (toll-free)

Email form

Ask a question

Office Hours: 9:00–18:00 CET (8:00–17:00 GMT) Monday–Friday; closed on local holidays.

Telephone

  • +44-161-855-7455 (toll)
Last updated 2017-08-21