E51 (Thiamine deficiency) is an umbrella ICD-10-CM medical diagnosis code in the Endocrine, nutritional and metabolic diseases chapter. It identifies cases of thiamine deficiency for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

E51 — Thiamine deficiency

Chapter E00-E89: Endocrine, nutritional and metabolic diseases

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Sub-codes under E51

E51.1BeriberiE51.2Wernicke's encephalopathyE51.8Other manifestations of thiamine deficiencyE51.9Thiamine deficiency, unspecified

Common questions about E51 (Thiamine deficiency)

What does ICD-10 code E51 mean?
E51 is the ICD-10-CM 2025 code for Thiamine deficiency. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is E51 a billable diagnosis code?
E51 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under E51. Browse the sub-codes listed on this page.
Which ICD-10 chapter does E51 belong to?
E51 belongs to the chapter "Endocrine, nutritional and metabolic diseases" (codes E00-E89). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Thiamine deficiency?
For a plain-language explanation of Thiamine deficiency, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Thiamine deficiency" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗