Find out about TRICARE at https://TRICARE.mil/. If you're new to TRICARE, check out https://TRICARE.mil/Plans/New. You can also review plan options, see what's covered, find a doctor, see costs, and review life events that impact your benefit. The site also has phone numbers for the TRICARE Regional Contractor.
You can also stop by or call Naval Hospital Jacksonville's TRICARE Health Benefits Advisors office, on the 1st floor of the Central Tower, at 904-542-9165.