ICD-10-CM E51 is the diagnosis code for Thiamine deficiency. This code falls under the section "Other nutritional deficiencies" within Chapter 4 — Endocrine, nutritional and metabolic diseases (E00-E89). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as E51. They are mutually exclusive:
Understanding where E51 sits in the ICD-10-CM classification helps ensure proper coding:
No, E51 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
E51 is the ICD-10-CM diagnosis code for "Thiamine deficiency". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
E51 is located in Section E50-E64 — "Other nutritional deficiencies" within Chapter 4 of the ICD-10-CM Tabular List.
E51 has 4 sub-code(s) that provide more specific detail: E51.1, E51.2, E51.8, E51.9.
Use E51 when the patients documented diagnosis matches "Thiamine deficiency" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Thiamine deficiency is E51.
No, E51 is non-billable. Use a more specific sub-code for primary diagnosis billing.
E51 is in Chapter 4 of the ICD-10-CM Tabular List.
Type 1 Excludes for E51 include: sequelae of thiamine deficiency (E64.8).
Yes, E51 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.