ICD-10 Code E56 – Other vitamin deficiencies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E56 – Other vitamin deficiencies
What it is
E56 identifies vitamin deficiency conditions not classified elsewhere. Use it when the record documents a deficiency of a specific vitamin or an unspecified vitamin deficiency outside the more common coded categories.
Clinical signs
Clinical features vary by the vitamin involved and the severity of deficiency; refer to documentation. Findings may include nonspecific fatigue, poor nutrition, or signs tied to the affected vitamin system.
When to use this code
Use E56 when the clinician documents a vitamin deficiency and no more specific ICD-10 code applies. It is appropriate for charted diagnoses such as “other vitamin deficiency” or a named deficiency that falls under this category. If the documentation is unclear, check documentation before assigning the code.
Do not use for
Do not use E56 when the record supports a more specific vitamin deficiency code or when the deficiency is not documented. Do not code suspected deficiency without provider confirmation.
Coding tip
Match the code to the exact vitamin named in the note, and use E56 only when the documentation supports a nonspecific or other vitamin deficiency.