ICD-10 Code E56.9 – Vitamin deficiency, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E56.9 – Vitamin deficiency, unspecified
What it is
E56.9 identifies a vitamin deficiency when the specific vitamin is not documented. Use it for a general deficiency diagnosis, not for a named vitamin disorder.
Clinical signs
Clinical features vary; refer to documentation. Common findings in vitamin deficiency may include poor nutrition, fatigue, weakness, mucosal changes, or other deficiency-related signs.
When to use this code
Use E56.9 when the record states vitamin deficiency but does not specify which vitamin is low or deficient. It also fits when the provider documents a nonspecific deficiency and no more precise code is supported. If the chart names a particular vitamin, code that specific condition instead.
Do not use for
Do not use E56.9 when the deficient vitamin is identified in the documentation. Also avoid it if the note describes malnutrition, anemia, or another condition without stating vitamin deficiency.
Coding tip
Check the assessment and problem list for the exact vitamin name before defaulting to E56.9.