ICD-10 Code C91.Z0 – Other lymphoid leukemia not having achieved remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C91.Z0 – Other lymphoid leukemia not having achieved remission
What it is
This code identifies a lymphoid leukemia that is still active and has not reached remission. Use it when the record specifies another lymphoid leukemia type, but not a more specific ICD-10 category.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart may describe persistent leukemia with abnormal lymphoid cells, ongoing disease burden, or lack of remission after evaluation.
When to use this code
Use C91.Z0 when the provider documents other lymphoid leukemia and states it has not achieved remission. It also fits when the leukemia is active, persistent, or refractory, and no more specific subtype code is documented.
Do not use for
Do not use this code if the record documents remission, a different leukemia subtype, or a more specific lymphoid leukemia code. Check documentation when the subtype or disease status is unclear.
Coding tip
Match both the leukemia type and remission status exactly as documented before assigning C91.Z0.