ICD-10 Code E53.9 – Vitamin B deficiency, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E53.9 – Vitamin B deficiency, unspecified
What it is
E53.9 identifies a vitamin B deficiency when the specific B vitamin is not documented. Use it when the record supports a B-complex deficiency but does not name the exact vitamin involved.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include fatigue, weakness, glossitis, neuropathic symptoms, or other signs consistent with B-vitamin depletion.
When to use this code
Use E53.9 when the clinician documents vitamin B deficiency without specifying B1, B2, B6, B12, or another exact type. It also fits when the chart notes a nonspecific B-vitamin deficiency and no further detail is available. Check documentation if the record suggests a more defined nutritional disorder.
Do not use for
Do not use this code when a specific vitamin B deficiency is documented, because a more precise code is usually available. Do not assign it for general malnutrition or anemia unless the provider clearly links them to unspecified vitamin B deficiency.
Coding tip
Review the assessment and problem list carefully; if the exact B vitamin is named, code that specific deficiency instead of E53.9.