ICD-10 Code E52 – Niacin deficiency [pellagra] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E52 – Niacin deficiency [pellagra]
What it is
E52 identifies niacin deficiency, also called pellagra. Use it when documentation confirms a lack of niacin or a pellagra diagnosis.
Clinical signs
Classic pellagra features include dermatitis, diarrhea, and dementia, though not every case shows all three. Clinical features vary; refer to documentation.
When to use this code
Use E52 when the provider documents niacin deficiency, pellagra, or a nutritional deficiency directly tied to niacin lack. It may also fit when the record clearly links symptoms to confirmed pellagra. If documentation is unclear, check documentation before coding.
Do not use for
Do not use E52 for nonspecific malnutrition, general vitamin deficiency, or suspected pellagra without confirmation. Avoid coding it when another documented cause explains the findings.
Coding tip
Code E52 only when the chart explicitly supports niacin deficiency or pellagra; otherwise, query the provider.