ICD-10 Code D51.3 – Other dietary vitamin B12 deficiency anemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D51.3 – Other dietary vitamin B12 deficiency anemia
What it is
D51.3 identifies anemia caused by inadequate dietary vitamin B12 intake. It is used when the chart documents B12 deficiency anemia related to diet rather than malabsorption or another specific cause.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include anemia symptoms and evidence of vitamin B12 deficiency, but you should not assume the cause without a recorded dietary link.
When to use this code
Use D51.3 when the provider states the anemia is due to poor dietary intake of vitamin B12. Apply it when the record distinguishes this from pernicious anemia, malabsorption, or other specified B12 deficiency causes. Check documentation if the cause is unclear.
Do not use for
Do not use this code for pernicious anemia, congenital B12 deficiency, or deficiency from intestinal malabsorption. If the chart does not specify a dietary cause, check documentation before assigning D51.3.
Coding tip
Look for explicit wording such as “dietary vitamin B12 deficiency anemia” or “due to poor intake” before coding D51.3.