280 Background: Effective care coordination (CC) is a critical component of high-quality cancer care; however, efforts to improve cancer care coordination are hampered by limited patient-centered measures. This mixed-methods research reports on patients’ feedback and the utility of a novel care coordination instrument (CCI) designed to assess cancer care coordination. Methods: 7 focus group discussions were conducted with 68 cancer patients receiving active therapy to evaluate validity of the CCI. Subsequently, the CCI was modified and administered to additional 200 cancer patients derived from community-based private and hospital clinics. The CCI is a 29-item, multiple-choice questionnaire and includes subscales that evaluate CC in 3 domains (Communication, Navigation, Operational) across 4 areas of CC (patient-physician; between providers; during inpatient-to-ambulatory care transitions; during transitions across phases of care). Results: Qualitative analysis of focus group discussions demonstrated that the CCI has good face and content validity. Content analysis identified the following themes: Survey, Education/Knowledge, Navigator, Communication, Support, Access, Providers, and Team. Questions with unclear wording or high proportions of not applicable or missing responses were refined or removed. Results of the revised survey indicated that the CCI is able to distinguish patient- and practice characteristics associated with optimal/poor CC. Specifically, cancer types (leukemia, myeloma) and having a patient navigator predicted high overall patients’ ratings of CC ( p < .05). Marginally significant differences were found for practice setting ( p = .085). A multiple regression model with all predictors entered simultaneously revealed that the presence of a family/friend caregiver significantly predicted better CC ( p < .001); however, the benefits of a patient navigator were no longer significant. Conclusions: This study demonstrates the utility of the CCI for assessing patients’ perspectives of cancer CC. Use and integration of this instrument in oncology practices/clinics can identify areas of potential interventions for CC improvement and lead to a better quality of care.