A patient’s electronic health record (EHR) may contain medical information that means the same thing but may have been recorded in many different ways. For example, the condition type II diabetes may be recorded as ICD9 code 250.00 at one doctor’s office or ICD10 code E11 at another. When All of Us receives a participant’s EHR, all of the codes (called source codes) are re-assigned a standard vocabulary code (e.g., for type II diabetes SNOMED 44054006). By changing or mapping all of the source codes to standard codes, the EHR can be more easily categorized and searched by researchers.
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