Because the patient does not actually have porphyria, the most accurate you can code is 277.9. It is a disease of the metabolism because the patient is have some sort of change/symptoms to the metabolism that were tested, but we should not give them that diagnosis because they do not actually have it.
Consider the case of a patient who has a disease that mimics HIV, should we give them a dx on their record of HIV because there is no specific code for this situation? No.
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