The audit process for HEDIS ECDS measures is evolving. Data sources fall under audit requirements for standard supplemental data. Plans complete a Roadmap for each data source so the NCQA-Certified auditor is aware of all data that are being considered for reporting. Auditors validate policies and procedures for each data source (e.g., file layout, mapping). Although primary source verification is not required, auditors may want to validate the primary source during an initial review of data, to ensure accuracy and validity.
HEDIS 2018