195 Background: Radiotherapy (RT) effectively palliates bone metastases, but relief may take weeks, frequently necessitating acute pain management (APM). NCCN Guidelines for Adult Cancer Pain (V2.2015) recommend initiation/titration of analgesics for patients with pain scale value (PSV) ≥ 4. We sought to evaluate how often symptomatic patients have analgesic regimens assessed and intervened upon at radiation oncology (RO) consult for bone metastases, and the impact of a dedicated palliative RO service on APM. METHODS We reviewed consult notes for 217 bone metastases patients treated with RT at Dana Farber Cancer Institute/Brigham & Women's Hospital (DFCI/BWH) and University of California, San Francisco (UCSF) during June-July 2008, Jan-Feb 2010, Jan-Feb 2013, and June-July 2014, time periods before and after implementation in 2011 of a dedicated palliative RO service at DFCI/BWH. For symptomatic patients, rate of assessment of analgesic regimen was recorded. Among patients with PSV ≥ 4, rate of pain intervention was recorded. The impact of a palliative RO service on these rates was evaluated. RESULTS Median age was 63 and median KPS was 70. Median PSV for painful bone metastases was 5 (IQR 2-7); 51% had PSV ≥ 4. Among symptomatic patients, analgesic regimen was assessed for 44.5% (51.7% at DFCI/BWH and 28.1% at UCSF). Among patients with PSV ≥ 4, pain intervention occurred for 17.2% (20.5% for DFCI/BWH, 0% for UCSF). At DFCI/BWH, consultation by a dedicated palliative RO provider was associated with higher rate of assessment of analgesic regimen (82.4% vs 47.7%, p = 0.007). At DFCI/BWH, consultation by a palliative RO provider was associated with higher rate of pain intervention (31.2% vs 7.9%, p = 0.012). There was no difference in analgesic regimen assessment or intervention between non-dedicated palliative RO providers at DFCI/BWH and UCSF (p = 0.07 and 0.09, respectively). CONCLUSIONS At two cancer centers, half of bone metastases patients seen for RT have PSV ≥ 4, yet a minority have analgesic assessment and intervention, indicating need for APM quality improvement in RO. An integrated palliative RO service was associated with improved assessment and management of acute pain per NCCN guidelines.