For years, erythropoiesis-stimulating agent (ESA) use among patients on dialysis was much higher in the United States than in Europe or Japan. Sweeping changes to dialysis reimbursement and regulatory policies for ESA in the United States in 2011 were expected to reduce ESA use and hemoglobin levels. We used the Dialysis Outcomes and Practice Patterns Study (DOPPS) data from 7129 patients in 223 in-center hemodialysis facilities (average per month) to estimate and compare time trends in ESA dose and hemoglobin levels among patients on hemodialysis in the United States, Germany, Italy, Spain, the United Kingdom, and Japan. From 2010 to 2013, substantial declines in ESA use and hemoglobin levels occurred in the United States but not in other DOPPS countries. Between August of 2010 and April of 2013, mean weekly ESA dose in the United States decreased 40.4% for black patients and 38.0% for nonblack patients; mean hemoglobin decreased from 11.5 g/dl in black patients and 11.4 g/dl in nonblack patients to 10.6 g/dl in both groups. In 2010 and 2013, adjusted weekly ESA doses per kilogram were 41% and 11% lower, respectively, in patients in Europe and 60% and 18% lower, respectively, in patients in Japan than in nonblack patients in the United States. Adjusted hemoglobin levels in 2010 and 2013 were 0.07 g/dl lower and 0.56 g/dl higher, respectively, in patients in Europe and 0.93 and 0.01 g/dl lower, respectively, in patients in Japan than in nonblack patients in the United States. In conclusion, ESA dosing reductions in the United States likely reflect efforts in response to changes in reimbursement policy and regulatory guidance. 27: 220527: -221527: , 201627: . doi: 10.1681 Deficient renal erythropoietin production is a major factor contributing to the anemic status that affects the vast majority of patients on dialysis. 1 Treatment with erythropoiesis-stimulating agents (ESAs) and intravenous (iv) iron has been the cornerstone of anemia management for over two decades. 9 on the matter, data from the US Renal Data System were shared that indicated that more than one half of United States patients on dialysis had Hb levels above the US Food and Drug Administration 10 (FDA) target range of 10-12 g/dl, and the US Government Accounting Office 11 (GAO) presented a 2006 report recommending implementation of an expanded bundled payment for dialysis services including renal medications and laboratory services. Subsequent regulatory action culminated in three important changes that occurred in 2011. In January of 2011, the US Centers for Medicare and Medicaid Services (CMS) introduced a major modification to the ESRD Prospective Payment System (PPS) that was fully implemented nearly 90% of United States dialysis units, with the remainder opting to phase in over 4 years. The revised PPS added approximately $3 billion worth of separately billable services to the bundled payment, of which dose-based reimbursement for ESAs and iv iron accounted for approximately 67% and 8%, respectively. 12 In June of 2011, the FD...