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The MSN lists all the services or supplies that were billed to Medicare for a 90-day period of time . If you do n't get any of these payments , you are billed by Medicare every three months . When the HPG was introduced , it was anticipated that only a proportion of patients treated in public facilities would be billed to Medicare . The physician also signed blank certificates of medical necessity so that the TENS units could be billed to Medicare . In addition , we noted isolated instances in which the physician did not authorize home health aide services , yet , the home health aide services were billed to Medicare contrary to Medicare regulations .