The Michigan OPEN prescribing recommendations have been updated for 2019: https://opioidprescribing.info/.

These recommendations for the number of opioid pills to be prescribed after 25 specific surgeries were developed by the Michigan Opioid Prescribing Engagement Network (OPEN) based on patient-reported data from the Michigan Surgical Quality Collaborative and published studies. Recommended amounts meet or exceed self-reported use of opioid pills by 75% of patients. Previous studies have shown that when patients are prescribed fewer pills, they consume fewer pills with no changes in pain or satisfaction scores. Many patients use 0-5 pills. Recommendations are for patients with no preoperative opioid use. For patients taking opioids preoperatively, prescribers are encouraged to use their best judgment.