ICD-10 Code C95.1 – Chronic leukemia of unspecified cell type (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C95.1 – Chronic leukemia of unspecified cell type
What it is
C95.1 identifies a chronic leukemia when the record does not specify whether it is lymphoid or myeloid. Use it for a long-standing leukemia diagnosis documented without a more exact cell type.
Clinical signs
Clinical features vary; refer to documentation. Chronic leukemia may be described with persistent abnormal blood counts, enlarged lymph nodes or spleen, fatigue, or other leukemia-related findings.
When to use this code
Use C95.1 when the provider documents chronic leukemia but does not identify the specific cell type. It is appropriate when the chart lacks enough detail for a more specific leukemia code. If later documentation names the subtype, code that more specific diagnosis instead.
Do not use for
Do not use this code for acute leukemia or for chronic leukemia with a documented specific type such as lymphoid or myeloid leukemia. Check documentation if the record is unclear.
Coding tip
Code the most specific leukemia type available; if the cell type is missing, C95.1 is the fallback.