Yes, you can. One key consideration, though, will be whether he can access in-network services while he is away at school. Some insurers sell coverage in many states and offer a regional or national provider network. In addition, some health plans may have agreements with insurers in other states to cover their providers as though they were in-network. If you can’t find a plan that offers network providers in both states, you could consider buying a separate plan for your son. You could also evaluate what out-of-network coverage, if any, your plan offers.