DX for Vegetarian?

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Hey all, in all fairness, that IS a completely valid question. I just came across a scenario where a patient was having a B12 lab drawn in a doctor's office in order to monitor their levels as a result of their vegan diet. BCBS CAM policy 130 indicates this as a medically necessary reason for performing this test, so to answer the question, yes, there is a Diagnosis that pertains to your dietary status that can be used to diagnose services rendered, the best I could find for this was Z78.9 for "Other specified health status".