E51 vs E64.8
E51 (Thiamine deficiency) compared with E64.8 (Sequelae of other nutritional deficiencies), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. E51 carries an Excludes1 note covering E64.8: “sequelae of thiamine deficiency (E64.8)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| E51Thiamine deficiency | E64.8Sequelae of other nutritional deficiencies | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) |
| Definition | Thiamine deficiency is a non-billable ICD-10-CM category code (E51). | Sequelae of other nutritional deficiencies is a billable ICD-10-CM diagnosis code (E64.8). |
| Code first | — | condition resulting from (sequela) of malnutrition and other nutritional deficiencies |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources