Missouri Physician's Affidavit is a legal document that is typically required when applying for certain types of benefits or services in the state of Missouri. This document is typically used to provide medical evidence that an individual is unable to engage in certain activities due to a medical condition. It is signed by a licensed physician, and can be used to certify that a person has a disability, is unable to work, or is unable to perform certain tasks. There are two main types of Missouri Physician's Affidavit: those that are used for disability benefits, and those that are used for Medicaid eligibility.