Understanding Reason Codes U5565 and U5566 is essential for hospice providers. These claim edits are triggered when admission dates differ from the election period start date on the beneficiary's Medicare record. By reviewing eligibility information and following guidance outlined in MM14227 and Change Request 14227, providers can avoid claim rejections and maintain billing compliance. https://rotbilling.com/understanding-reason-codes-u5565-and-u5566-for-hospice-claims/