ICD-10 Code D46.Z – Other myelodysplastic syndromes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D46.Z – Other myelodysplastic syndromes
What it is
D46.Z identifies myelodysplastic syndromes that do not fit a more specific ICD-10 category. These are clonal bone marrow disorders with ineffective blood cell production and risk of progression to acute leukemia.
Clinical signs
Clinical features vary; refer to documentation. Common findings include anemia, fatigue, recurrent infections, easy bruising, or other cytopenia-related signs, with marrow dysplasia supporting the diagnosis.
When to use this code
Use D46.Z when the provider documents a myelodysplastic syndrome but does not specify a more defined subtype. It is appropriate for nonspecific MDS descriptions, including cases labeled “other” or not otherwise classified.
Do not choose this code if the record identifies a specific myelodysplastic syndrome subtype or another marrow disorder. Check documentation carefully for the exact diagnosis and any linked cytopenias.
Do not use for
Do not use D46.Z for aplastic anemia, leukemia, or clearly specified MDS subtypes coded elsewhere. If the diagnosis is uncertain or incomplete, check documentation.
Coding tip
Report the most specific MDS code available; use D46.Z only when the provider’s documentation remains nonspecific.