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Question

Can you use an ICD-10-CM code for the PrimaryCancerCondition code and an ICD-O-3 code for the HistologyMorphology extension?

Answer

There are no constraints in the spec stopping you from doing that but it really doesn’t make sense to mix and match having just ICD-10-CM and an ICD-O-3 morphology code without a topology code.

That is why we placed the table in the Representing Cancer Diagnosis section of the homepage. The intent is that if a source application was going to send a cancer patient record to a registry (e.g., SEER) then ICD-O-3 is sent and not ICD-10-CM. And since the FHIR condition resource requires a Condition.code, we need to have some placeholder for its representation.

This applies to profiles inheriting from CancerConditionParent, namely PrimaryCancerCondition and SecondaryCancerCondition.  

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