AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2023 Issue 1; Ask the Editor

Small Lymphocytic Lymphoma/Chronic Lymphocytic Leukemia

A patient with small lymphocytic lymphoma (SLL)/chronic lymphocytic leukemia (CLL) in relapse presents to his primary care physician for follow-up. The provider documented, “No lymph node involvement.” Would the physician need to document CLL with SLL of “B-cell type” in order to assign a code from subcategory C91.1, Chronic lymphocytic leukemia of B-cell type, or does the classification presume “B-cell type” when SLL/CLL is documented in the health record? Additionally, there are mutually exclusive Excludes1 notes at both subcategories C83.0, Small cell B-cell lymphoma, and C91.1, Chronic lymphocytic leukemia of B-cell type. What is the correct ICD-10-CM code assignment for SLL/CLL? ...

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