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Methods: Using the Corporate Data Warehouse (CDW) for the Mid-Atlantic Veteran Affairs Medical Region (includes North Carolina, Virginia and a portion of West Virginia), we identified Veteran Health Administration (VA) patients who received inpatient or outpatient care for ILD (as defined by ICD 9 code 515: Identifying patients with diagnostic codes followed by a detailed chart review and database query offers the opportunity to define the types and characteristics of ILD in a VA population and will enhance our understanding of the epidemiology of these diseases.