here is the address
IDEA Health & Fitness Association
10455 Pacific Center Court
San Diego, CA 92121
Phone: (858) 535-8979, ext. 7
Toll-free: (800) 999-4332, ext. 7
Fax: (858) 535-8234
Before you send a check, though, I would suggest that you call IDEA. While IDEA has an insurance company association, I do not believe that you should send the check to them. I would suggest that you check the policy of the insurance company and see whether you find an address there. Else, try googling their name, and you should be able to find an address or a telephone number.