Missouri Social Security Complaint is a legal action taken when a person believes he or she has been wrongfully denied Social Security benefits. This includes disability, retirement, and survivor benefits. There are three types of Missouri Social Security Complaint: Social Security Disability Insurance (SDI) Complaint, Supplemental Security Income (SSI) Complaint, and Medicare Complaint. An SDI Complaint is filed when an individual believes they have been wrongfully denied disability benefits. An SSI Complaint is filed when an individual believes they have been wrongfully denied financial assistance due to their income and resources. A Medicare Complaint is filed when an individual believes they have been wrongfully denied access to medical benefits. All complaints must be filed with the Social Security Administration and must include an explanation of why the complaint is being filed and any supporting evidence. Once the complaint is filed, the Social Security Administration will investigate the claim and make a decision whether the individual is eligible for benefits.