Pharmacoepidemiology and Drug Safety
The Veterans Aging Cohort Study ( VACS )‐National: A Real‐World Data Source Profile
ABSTRACT The Veterans Aging Cohort Study (VACS)‐National is a large, longitudinal real‐world data resource derived from electronic health records within the Department of Veterans Affairs (VA), the largest integrated healthcare system in the United States. As of December 2025, VACS‐National includes > 14.9 million Veterans who have received care in the VA since 2000. It captures information on VA‐related outpatient and inpatient care and includes structured (e.g., diagnostic codes, laboratory results, vital signs, …