You need to speak to someone about additional coverage to Medicare Parts A and B.

Which of the following organizations should you contact?
A. TRICARE C. CHAMPVA
B. Blue Cross and Blue Shield D. Indian Health Service

To determine which organization to contact regarding additional coverage to Medicare Parts A and B, we can go through the options one by one.

A. TRICARE: TRICARE is a healthcare program providing coverage for members of the United States military, their families, and veterans. If you are not affiliated with the military or related to someone who is, TRICARE may not be the appropriate option for you.

B. Blue Cross and Blue Shield: Blue Cross and Blue Shield (BCBS) is a federation of independent health insurance organizations that serve millions of Americans. BCBS provides a range of health insurance plans, including supplemental plans to Medicare. Contacting BCBS could be a good option to explore additional coverage options.

C. CHAMPVA: CHAMPVA (Civilian Health and Medical Program of the Department of Veterans Affairs) provides healthcare benefits for spouses or dependents of veterans who are permanently and totally disabled due to a service-related condition or who died while on active duty. If you do not meet the eligibility criteria, CHAMPVA may not be the appropriate organization to contact.

D. Indian Health Service: The Indian Health Service (IHS) provides medical assistance to members of federally recognized Native American tribes or Alaska Native people. If you do not meet the criteria, IHS may not be the appropriate organization for additional coverage.

Based on the given options, it seems that contacting Blue Cross and Blue Shield (option B) is the most suitable course of action for obtaining additional coverage to Medicare Parts A and B. However, it is always advisable to research and inquire with multiple organizations to explore all available options that may meet your specific needs.