['Chronic opioid therapy for chronic pain treatment has increased. Hospital physicians, including hospitalists and medical/surgical resident physicians, care for many hospitalized patients, yet little is known about opioid prescribing at hospital discharge and future chronic opioid use.', "We aimed to characterize opioid prescribing at hospital discharge among 'opioid naïve' patients. Opioid naïve patients had not filled an opioid prescription at an affiliated pharmacy 1 year preceding their hospital discharge. We also set out to quantify the risk of chronic opioid use and opioid refills 1 year post discharge among opioid naïve patients with and without opioid receipt at discharge.", 'This was a retrospective cohort study.', 'From 1 January 2011 to 31 December 2011, 6,689 opioid naïve patients were discharged from a safety-net hospital.', 'Chronic opioid use 1 year post discharge.', 'Twenty-five percent of opioid naïve patients (n\u2009=\u20091,688) had opioid receipt within 72 hours of discharge. Patients with opioid receipt were more likely to have diagnoses including neoplasm (6.3% versus 3.5%, p\u2009<\u20090.001), acute pain (2.7% versus 1.0 %, p\u2009<\u20090.001), chronic pain at admission (12.1% versus 3.3%, p\u2009<\u20090.001) or surgery during their hospitalization (65.1% versus 18.4%, p\u2009<\u20090.001) compared to patients without opioid receipt. Patients with opioid receipt were less likely to have alcohol use disorders (15.7% versus 20.7%, p\u2009<\u20090.001) and mental health disorders (23.9% versus 31.4%, p\u2009<\u20090.001) compared to patients without opioid receipt. Chronic opioid use 1 year post discharge was more common among patients with opioid receipt (4.1% versus 1.3%, p\u2009<\u20090.0001) compared to patients without opioid receipt. Opioid receipt was associated with increased odds of chronic opioid use (AOR\u2009=\u20094.90, 95% CI 3.22-7.45) and greater subsequent opioid refills (AOR\u2009=\u20092.67, 95% CI 2.29-3.13) 1 year post discharge compared to no opioid receipt.'] Does opioid Prescribing at Hospital Discharge contribute to Chronic Opioid Use?