ICD-10 Code D51.1 – Vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D51.1 – Vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria
What it is
D51.1 identifies vitamin B12 deficiency anemia caused by selective malabsorption of vitamin B12, with proteinuria as part of the documented condition. Use it when the record clearly links the anemia to this specific absorption disorder.
Clinical signs
Clinical features usually reflect vitamin B12 deficiency anemia, such as fatigue, pallor, and other anemia-related findings. Documentation should also show selective B12 malabsorption and proteinuria; if details are unclear, check documentation.
When to use this code
Use D51.1 when the provider documents vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria. It is appropriate when the diagnosis is explicit, even if the note focuses on anemia rather than the absorption disorder.
Assign this code when the chart ties the anemia to this specific cause and the proteinuria is part of the documented condition. If the record only says B12 deficiency or malabsorption without this exact link, verify the wording before coding.
Do not use for
Do not use D51.1 for unspecified B12 deficiency anemia, dietary deficiency, or anemia from other causes. Do not assume proteinuria or malabsorption if the documentation does not state them.
Coding tip
Code D51.1 only when the provider clearly documents the full causal phrase; otherwise, query or check documentation for a more accurate code.