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Association of Opioid Type with Opioid Consumption after Surgery. OBJECTIVE: This study was designed to test the hypothesis that patients prescribed hydrocodone consume a similar number of tablets as those prescribed oxycodone after surgery. SUMMARY BACKGROUND DATA: In October 2017, the Michigan Opioid Prescribing Engagement Network released opioid prescribing guidelines for surgeries. For each procedure, these guidelines recommended prescribing 50% more tablets of hydrocodone than tablets of oxycodone to adjust for potency differences. These guidelines were simplified in January 2019 to recommend the same number of 5 mg hydrocodone tablets as 5 mg oxycodone tablets for each procedure. METHODS: Retrospective, observational analysis of opioid-naïve adults who underwent surgical procedures across 64 hospitals in Michigan and were prescribed 5 mg tablets of hydrocodone or oxycodone between January 1, 2018 and May 31, 2019. The primary outcome was number of tablets consumed. We defined a meaningful difference in consumption as 5 pills a priori. Secondary outcomes included self-reported pain, satisfaction and opioid refills. RESULTS: A total of 6,842 patients were included. Adjusting for covariates, patients prescribed hydrocodone consumed 7 tablets (95% CI 6.79-7.18) while patients prescribed oxycodone consumed 6 tablets (95% CI 5.58-6.40.) Comparing patients prescribed oxycodone with those prescribed hydrocodone, there were no differences in satisfaction, pain, or refills. CONCLUSIONS: Although patients prescribed hydrocodone consumed more tablets than patients prescribed oxycodone, this difference was not clinically significant and did not result in differences in satisfaction, pain, or refills. Perioperative opioid prescribing guidelines may recommend the same number of 5 mg oxycodone and hydrocodone tablets without sacrificing patient-reported outcomes.