Improving Access to Transfusion Care for Hospice Patients Act of 2023 This bill requires the Center for Medicare and Medicaid Innovation (CMMI) to test a model under which blood transfusions furnished to an individual receiving hospice care are paid separately from the hospice all-inclusive per diem payment under Medicare. The CMMI must evaluate the model by comparing patients participating in the model with those outside of the model in relation to specified metrics, such as hospital utilization and days of hospice care before the end of life.