OBJECTIVES: Changes in payments systems, such as the introduction of bundled payments, require understanding of patient care quality measures, particularly for joint replacements.  This study used Medicare claims data to evaluate factors associated with re-admission within 30 days following discharge from hip/pelvic fracture inpatient stays. METHODS: An analysis of the 5% sample of Medicare claims for 2009-2013 was completed for beneficiaries who had an inpatient stay with a hip/pelvic fracture principal diagnosis between 6/1/2009 and 11/30/2013 (index hospitalization). Beneficiaries were 65 years or older at index, continuously enrolled in Medicare FFS for at least 6 months prior to and 1 month following index, and survived the index hospitalization. Logistic regression was performed on all-cause re-admissions within 30 days of discharge from the index hospitalization. Explanatory variables included age, gender, race, index length of stay (LOS), discharge status, and comorbid conditions assessed in the 6 months before and on index - atrial fibrillation (AF), Alzheimer’s and related disorders or dementia (ADRD), COPD and bronchiectasis, depression, diabetes, and heart failure. RESULTS: We identified 40,259 eligible beneficiaries. Mean (SD) age was 82.2 (7.6), 75.0% were female, mean (SD) LOS was 6.8 (4.6), and 61.3% were discharged to a skilled nursing facility (SNF). Rates of comorbid conditions ranged from 24.8% for depression to 34.3% for ADRD. Of the 40,259 beneficiaries, 6,156 (15.3%) had a 30-day re-admission. Factors associated with higher likelihood of re-admission included older age (85+ vs 65-74: OR=1.12; p=0.01), male gender (OR=1.31;p<0.0001), longer LOS (>8 vs ≤8 days: OR=1.49;p<0.0001), AF (OR=1.18;p<0.0001), COPD (OR=1.33;p<0.0001), depression (OR=1.13;p=0.0003), diabetes (OR=1.23;p<0.0001), and heart failure (OR=1.45;p<0.0001). Factors not found to be significant at p<0.05 included ADRD, discharge to SNF, and race.    CONCLUSIONS: Results indicated a 30-day re-admission rate of 15.3% after hip/pelvic fracture stays. Factors associated with re-admission included age, gender, index LOS, and select comorbid conditions.