I have billed new CPT Code 43762 (peg exchange ) I added Modifer 52 due to Dr removed and exchange the peg after trying to replace the new peg (that we provided ) the size was incorrect therefor dr place the old peg .Note patient was a Medicare /HMO that we do not accept and was send from a nursing facility . I billed an E&M code along . Now I received a called from director of the facility stating that we are committing fraud due to the peg exchange (note they were aware of what happened ) and we have our documentation supporting this ?! Am I wrong to Bill the peg with mod 52 ?? Please help