ICD-10 Code D63 – Anemia in chronic diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D63 – Anemia in chronic diseases classified elsewhere
What it is
D63 identifies anemia that occurs as a complication of another chronic disease. You use it when the anemia is linked to an underlying condition rather than documented as a primary blood disorder.
Clinical signs
Clinical features vary; refer to documentation. Common findings of anemia may include fatigue, pallor, weakness, or reduced exercise tolerance, but the record should show the chronic disease relationship.
When to use this code
Use D63 when the provider documents anemia due to a chronic disease and the causal condition is also identified. This code supports cases where anemia is secondary to another long-term disorder, not a standalone diagnosis. Check documentation if the chart does not clearly link the anemia to the underlying disease.
Do not use for
Do not use D63 for anemia without a documented chronic disease cause. Do not use it when the record identifies a different specific anemia type that should be coded instead.
Coding tip
Always code the underlying chronic condition first and verify that the provider explicitly connects it to the anemia.