They might, which is why I recommend a paper claim with a letter attached and stamping the claim "Corrected Claim". We used to have a separate drop off for those claims when I was a claims examiner. The standard procedure was to pull the previous claim, if payment was sent out they will request a refund, and create an adjusted claim. The reason I say not to wait is so you don't get the letter asking for the money back and have to wait longer. I also usually will call and tell them I'm submitting a corrected claim and they will sometimes go pull it and put it in pending status for the corrected claim.