If your employer does not provide medical insurance and you cannot get it through an association (or as a self-employed individual), you may have to purchase insurance on your own. The rules governing the availability of this coverage are different in each state. Premiums are generally higher, and benefits offered are sometimes less extensive than through a group plan. Please Note: There is one national rule. If you have had 18 months of employment-based health coverage and you have exhausted all your rights to COBRA coverage (or other rights to continue on any other employment-based health plan), then any insurer selling individual coverage in your state must sell you a policy, regardless of your medical condition or vocation.