Ben Glass is licensed in Virginia. He offers a number of free consumer book downloads at his site for information purposes only. You should consult an experienced, board certified attorney in your area. Obviously, no attorney client relationship is formed by participating in Avvo.
The answer, most likely, depends on how "pre-existing" is defined in the policy.
Often have a pre-existing condition can mean that you received, or should have received, treatment, medicine, or testing for any condition during the preceding time period in question.
Look at the policy and/or consult with an attorney who handles disability claims to get more clarification.