We billed Highmark Medicare for 64622 RT, 64623 x 3 RT for a 2/18/09 date of service. Pt returned and had 64622 LT, 64623 x 3 LT for 2/27/09. Medicare paid the 1st DOS and denied the 2nd as "payment included in the allowance for another service". I appealed, included copies of dictation for all dates of service, noting the Right & Left in particular. I received a 2nd denial as within the global period. What am I missing? Does the global period for the right side include any services done to the left side? Thanks ahead for any direction!