If you think they are wrong, if the insurance is through your employer, you should find an attorney who represents clients with employment benefit claims, also known as ERISA claims to review your health insurance policy and your medical records to determine if they are right. If it is your own private insurance policy, and ERISA lawyer, or a litigation/contracts attorney can help. If you agree that it is a pre-existing condition, and if the policy clearly excludes pre-existing conditions, then you will owe the bill as if you have no insurance. However, it may still be worth consulting an attorney because laws have been passed limiting the ability of insurers to exclude pre-existing conditions.
Answered on Nov 13th, 2012 at 5:30 PM