ICD-10 Code D77 – Other disorders of blood and blood-forming organs in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D77 – Other disorders of blood and blood-forming organs in diseases classified elsewhere
What it is
D77 identifies disorders of the blood or blood-forming organs that are caused by another underlying disease. Use it when the blood condition is secondary and the record links it to a separate primary diagnosis.
Clinical signs
Clinical features vary; refer to documentation. You may see anemia, abnormal blood counts, or other hematologic changes described as due to an underlying condition rather than a primary blood disorder.
When to use this code
Use D77 when the provider states that a blood or blood-forming organ disorder is due to another disease and no more specific code is available. It is appropriate when the causal condition is documented and the hematologic problem is secondary. Code the underlying disease first when instructed by ICD-10-CM guidelines.
Do not use for
Do not use this code for primary blood diseases, hereditary hematologic disorders, or conditions with a more specific ICD-10-CM code. Check documentation if the record does not clearly link the blood disorder to another disease.
Coding tip
Always confirm the underlying cause in the chart before assigning D77.