“…Among included studies, the most commonly evaluated outcomes were post-discharge linkage to care (11 studies), 13 , 16 – 20 , 22 , 24 – 26 , 33 readmission (6 studies), 15 , 18 , 21 , 25 – 27 and in-hospital MOUD initiation (6 studies) 15 , 19 , 24 , 25 , 27 , 33 . Regarding outcome measures for the 12 studies with a control group, most studies identified outcomes through chart review 13 , 15 , 18 , 25 , 27 or diagnosis codes, 17 , 21 , 23 , 24 , 26 while others used research staff 20 including through timeline follow-back 34 . Wang and colleagues defined linkage to care as when a provider discharged a patient with a buprenorphine prescription and a scheduled outpatient buprenorphine appointment, 25 while others defined it as post-hospital OUD treatment engagement 18 , 24 , 34 within 30, 13 , 20 34, 17 or 90 days 20 .…”