Under the ACA, the Physician Value-Based Modifier (Value Modifier) policy rewards physicians and groups of physicians who provide high quality and cost effective care, while penalizing those who did not meet objectives. Physicians in group practices of 100 or more eligible professionals who submit claims to Medicare under a single tax identification number are subject to the value modifier in 2015, based on performance in 2013. CMS has provided details on Value Modifier payment adjustments for applicable physician groups in 2015, including how groups that elected quality-tiering performed.