Can your 28 year old child ull time student be covered under my family medical insurance policy?

The rules regarding dependent coverage vary depending on the insurance plan and the state in which you reside. In general, however, children are eligible for dependent coverage under a parent's health insurance plan until they reach a certain age, typically 19, 23, 25, or 26, depending on the state. After this age, children are no longer eligible for dependent coverage unless they are disabled or meet certain other specific conditions.

For your 28 year old child, therefore, it is likely that they will no longer be eligible for dependent coverage under your family medical insurance. You should check with your insurance company to confirm this and to inquire about any other options that may be available for coverage.