Is an insurer able to add a family member to a pre-existing health plan without their approval?

Question Details: My father had a health insurance plan that he was given through his employer 5 to 6 years ago. After, he had taken me off of it. This January he once again has the plan. I have Medicaid and I have had it for years. My father has never placed me under his account at any point. This past month I was notified during a doctor appointment that I have insurance under the same company and it is under his plan. I now have ton pay the deductible amount though there has been and never was an instant where my father, nor I, have EVER placed me onto his plan. Now every place I go I cannot go to the doctor because I have to pay for it and they are not able to bill my Medicaid. Is this allowed?

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