Insurance denies coverage for weight loss surgery because you are 11 lbs under what they require and a few months later you have gained more weight will they cover it now if you re-submit a claim?

If you have already had the surgery, and the claim was denied because you did not meet the requirements at the time of the procedure, then it will almost certainly not be covered. If you have not yet had the surgery, and you have been covered continuously, it would be worthwhile to resubmit a claim to see if it is covered now that you meet the requirement.