Advent’s HEDIS 2026 webinar series kicked off last month with Optimizing Clinical Data Quality, a presentation focused on common challenges with supplemental clinical data. Key takeaways include the following:  Transition in Data Collection: The shift from manual data collection to digital HEDIS reporting has increased the focus on clinical data over claims data. NCQA’s planned elimination of the hybrid reporting method has added urgency to this transition, driving plans to acquire more electronic clinical data and adapt to year-round ingestion. Challenges with Clinical Data: The presentation highlighted several challenges to the acquisition of supplemental clinical data, including data timing, completeness, and accuracy. Issues such as short turnaround times, missing biometric values, and incorrect coding have impacted the useability of these additional data sources for HEDIS reporting. Tips for Navigating the Transition: Plans can navigate this transition by starting early with clinical data validation, engaging with IT departments, exploring vendor’s reports and supportive capabilities, and building executive leadership buy-in.