Peruse the 10-day versus 90-day global package details. A review of global surgery distinctions is a great starting point to avert modifier 57 (Decision for surgery) issues. Consider these two Medicare guidelines on 10-day and 90-day global surgery packages that may factor into your CPT® coding. 1. See CMS clarifications on 10-day global surgery packages: 2. Consider the following CMS specifications to classify 90-day global period procedures: Remember: CMS classifies “major” surgeries with a 90-day global period designation and “minor” surgeries with a 10-day global period designation. Resource: For a closer look at the MLN Global Surgery Booklet visit www.cms.gov/Outreach-and-Education/Medicare-Learning-Network-MLN/MLNProducts/downloads/GloballSurgery-ICN907166.pdf.