ICD-10-CM
ICD-10 code for Encephalopathy (acute) pellagrous: E52
The ICD-10-CM index points "Encephalopathy (acute) pellagrous" to E52, Niacin deficiency [pellagra]. E52 is a billable code. The index also gives G32.89 (Other specified degenerative disorders of nervous system in diseases classified elsewhere) for the manifestation, the problem the disease causes. Report E52 first, then G32.89.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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