ICD-10 Code D47.Z9 – Other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D47.Z9 – Other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue
What it is
This code identifies a neoplasm of lymphoid, hematopoietic, or related tissue whose behavior is uncertain and does not fit a more specific ICD-10-CM category. Use it when the record names another specified lesion but does not document a definitive malignant or benign diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Records may describe an abnormal lymphoid or blood-forming tissue mass, atypical cells, or a pathologic finding that is not clearly benign or malignant.
When to use this code
Use D47.Z9 when the provider documents a specified neoplasm of uncertain behavior involving lymphoid, hematopoietic, or related tissue and no more specific code applies. It is appropriate when pathology or clinical notes support uncertain behavior, but the exact entity is not otherwise classified.
Choose this code only after reviewing the full report for the exact wording. If the documentation instead confirms a malignant neoplasm, a benign tumor, or a different hematologic disorder, code that condition instead.
Do not use for
Do not use this code for clearly malignant lymphoid or hematopoietic neoplasms, benign neoplasms, or unspecified masses without documentation of uncertain behavior. Check documentation if the pathology report is incomplete.
Coding tip
Code the most specific documented diagnosis and verify that “uncertain behavior” is explicitly stated before assigning D47.Z9.