Websites & Phone Numbers Click the blue link below for website: • Social Security Office Or call 1-800-772-1213• Medicare Or call 1-800-633-4227• CLAIM State Health Insurance Assistance Program Or call 1-800-390-3330• Missouri Health Insurance Pool Or call 1-800-821-2231• Choosing a Medigap Policy Handbook Download your Free PDF copy by clicking the link above. (requires Adobe Acrobat reader)