File claims within 30 days of injury, first treatment or as soon as reasonably possible. Bills should be received within 90 days of service.The Student Health Insurance Policy allows you to add your dependents to your coverage. Students must complete a Dependent Enrollment Form available HERE. These sample letters can be used in various circumstances you may encounter that require you to communicate with insurance companies. Insurance. Dallas College strongly recommends that international students obtain health insurance for the duration of their studies. Download and complete the Core Residency Questions Form. Click the button below to begin electronically signing the form. You may also download the Health History form to print, fill out, and send back to us. Listing of all TDI forms.