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Phecode mappings of codes from the ninth edition of the International Classification of Diseases (ICD9). In this example, the individual has five unique ICD9 codes that map to two phenome-wide association study (PheWAS) phecodes. The circled numbers indicate the number of occurrences of each code in the individual’s electronic health record (EHR). Typically, a code must be billed two or three times in order to be considered a case for the phecode.
