Health insurance coverage is an important consideration for many people. This article explores the question of whether health insurance coverage begins from day one. In some cases, coverage begins on the day of enrollment, but this is not always the case. Depending on the health insurance plan, there may be a waiting period before coverage begins, and this could be anywhere from a couple of days to several months. Additionally, certain services may be excluded from coverage until the plan's waiting period has been met. It is important to check with the insurance provider to determine when coverage begins.