59 vs 76/77 modifier for medicare

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The group I code for we often see multiple chest xrays and/or abdominal xrays in the same day checking ET tubes and NG tubes. For a 71020 we code 26 52 77/76 and the the time in the HCFA 19 line. Does anyone know if this is the correct way across the board for medicare and private insurance's? If so, can you provide a reference?

59 vs 76/77 modifier for medicare