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However, only 31.1% (95%CI 29.3-33.0%) of encounters were verified by reviewers as true recurrent VTE. Hospital or ED encounters with VTE codes in the primary position were more likely to represent valid recurrent VTE (PPV 61.3%, 95%CI 56.7-66.3%) than codes in secondary positions (PPV 35.4%, 95%CI 31.9-39.3%), or outpatient codes (PPV 20.3%, 95%CI 18.3-22.5%). PPV was low for all VTE types (29.9% for pulmonary embolism, 38.3% for lower and 37.7% for upper extremity deep venous thrombosis, and 14.1% for other VTE). CONCLUSIONS ICD-9 codes
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