Can I change my health insurance plan to add a step-child?

Yes, you should be able to add your stepchild to your health insurance plan. Family members eligible for coverage under your health plan include your spouse (including a valid common law marriage) and children under age 26, including legally adopted children, recognized natural (born out of wedlock) children and stepchildren (including children of same-sex domestic partners). You can add your stepchild to your health insurance plan during open enrollment, or if adding your stepchild meets the definition of a qualifying life event, during a special enrollment. Typically a dependent stepchild must be living with you (rather than another parent) to be added to your insurance coverage. Check your plan for any other special requirements.