Evidence of Insurability (EOI), also known as the proof of good health, is the documentation of the good health condition of the beneficiary and his/her dependent’s health in order to be approved for coverage. EOI is required for some types of coverage. While applying for an individual health insurance plan, an applicant must confirm his or her physical fitness in writing, through a questionnaire or through a medical examination. When applying for group health insurance, evidence of insurability is required only if the 30-day eligibility period expires before the employee has applied for coverage. EOI is required for enrollment, to add dependents, and to increase some GBP insurance coverage.