330 Accuracy and Clinical Significance of Neurosurgical Patient Safety Indicator Events Reported by Centers for Medicare Services

Abstract

INTRODUCTION: Data on patient safety indicator (PSI) events are used by Center for Medicare Services (CMS) for determining reimbursement to hospitals, and public quality reporting. It is unclear whether the process used by CMS to detect PSI events is accurate, and whether PSI events affect clinical outcomes in neurosurgical patients. METHODS: We reviewed CMS reported PSI events in neurosurgical patients at our hospital from July 1, 2018, through December 31, 2019. Discharge billing codes were reviewed in order to assess whether CMS criteria for PSI were met. Charts were reviewed by experienced clinicians in order to assess the accuracy and clinical significance of CMS reported PSI events. For deep venous thrombosis/pulmonary embolism (DVT/PE) PSI events, chart reviews were performed in order to assess whether standard of care prophylaxis was administered. RESULTS: 14 PSI events were reported in 11 patients, representing 1.3% of neurosurgical procedures in fee for service medicare patients. 7 patients underwent spinal surgery and 4 underwent cranial surgery. PSI events included DVT/PE (n = 6), postoperative hematoma (n = 2), postoperative respiratory failure (n = 5), and iatrogenic pneumothorax (n = 1). Only 10/14 PSI events (71%) met CMS criteria based on discharge billing codes, and only 8/14 PSI events (57%) met CMS criteria based on chart review. All PSI events that were confirmed based on chart review required specific medical or surgical treatment, but only 5 (63%) led to increased length of stay, and no patients had residual adverse effects at hospital discharge. 5/6 patients with chart confirmed DVT/PE (83%) received standard of care DVT prophylaxis. CONCLUSIONS: CMS-reported PSI events have significant rates of inaccuracy. PSI events may not correlate with meaningful adverse clinical outcomes. DVT/PE PSI events were not associated with breaches in standard of care.