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A seemingly simple case is the editions of ICD, e.g. ICD9, ICD10, ICD11 - these are usually considered separate terminologies, since they are issued quite a few years apart and have significant differences. But we have also ICD9CM (US clinical modifications), ICD10AM (Australian modifications) and many other variants. Can a code within ICD10AM be considered to have the same meaning (classify the same real-world phenomena) as the same code in the original ICD10?
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