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Validation of a coding algorithm to identify patients with hepatocellular carcinoma in an administrative database

International Classification of Disease, Ninth Revision, Clinical Modification (ICD‐9‐CM)‐based algorithms to identify patients with hepatocellular carcinoma (HCC) have not been developed outside of the Veterans Affairs healthcare setting. The development and validation of such algorithms are necessary for the conduct of population‐based studies evaluating the epidemiology and comparative effectiveness and safety of therapies for HCC.