Has anyone had experience with billing unlisted codes with Medicare? I keep getting denials from Medicare for 64999 with the description Erector Spinal Plane. Medicare states that this is not a sufficient description for this code. They will not give you any clue as to what is a sufficient description. I am doing anesthesia billing and we have a practice that uses Erector Spinal Plane quite often. They have paid in the past but recently have started requiring the description in block 19 on the claim.