Pellagra

This code represents pellagra, a systemic disease caused by a severe deficiency of niacin (vitamin B3) or its precursor, tryptophan. It is characterized by the "3 Ds": dermatitis (photosensitive rash), diarrhea, and dementia, and can be fatal if untreated.

Use this code for documented cases of pellagra due to nutritional deficiency. This includes cases where the patient presents with the classic triad of symptoms or a clear history of inadequate niacin intake. Documentation should specify the diagnosis of pellagra.

• Ensure documentation clearly links symptoms to a niacin deficiency.
• Consider sequencing if other nutritional deficiencies are also present.
• Distinguish from other dermatological conditions or dementias not caused by pellagra.