33 Background: Texas Oncology (TO) is a community-based practice. with over 250 physicians (MD) who order chemotherapy. In 2015, pegfilgrastim (pgcsf) was the highest individual drug in billed claims. Concurrently, TO was participating in the United Healthcare (UHC) Episode of Care (EOC) program and anticipating the Oncology Care Model. Patient and program expense dictated understanding pgcsf utilization. Methods: Data were obtained in 9/2015 from EOC claims to identify overall and individual pgcsf use in solid tumor metastatic disease (MDx). Chart review was done for the top prescribers. In 3/16, ASCO pgcsf guidelines and TO education materials were emailed to all physicians. In 3/17 appropriate non-use recommendations were communicated and a real-time internal approval process begun. On 10/1/2017, UHC instituted a pgcsf prior authorization (PA) program. Retrospective data from the iKnowMed EHR system was collected in 3-month intervals from April 2016 through March 2018 and evaluated for number of pgcsf administrations at TO for MDx, as well as, administrations/provider/quarter for TO and The US Oncology Network. MDx was defined by any of the following criteria: stage IV at diagnosis (with certain disease exceptions); TNM M value of “1” or “+”; a metastatic line of therapy; evidence of metastatic disease documented within the EHR. Results: Initial survey of EOC claims indicated 16% of patients received pgcsf for MDx. Rates per MD ranged from 0 to 57%. Review of the top users indicated 90% of uses could have been addressed with dose reduction. In the first measured quarter of April to June 2016 to the last, October to December 2017, pgcsf use dropped by 50%. Changes for some diseases were dramatic: Use in colon cancer fell from 132 uses/quarter to a low of 46, and for non-small lung cancer – 80 to 23 respectively. Conclusions: The deadopting of low value care can be challenging. In the case of pgcsf substantial reductions in use were achieved using data and guidelines for education in the setting of value based contracts. Ultimately, the most change was achieved by an internal real time approval process. This was reinforced by a payer PA requirement.