ICD-10 Code C91.Z1 – Other lymphoid leukemia, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C91.Z1 – Other lymphoid leukemia, in remission
What it is
C91.Z1 identifies a history of other lymphoid leukemia that is currently in remission. Use it when the documentation states the leukemia is not active, but the specific lymphoid subtype is not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. In remission, records typically note absence of active leukemia findings and continued monitoring for recurrence or residual disease.
When to use this code
Use this code when the clinician documents other lymphoid leukemia as in remission, including follow-up visits after treatment. It may also apply when the chart clearly states remission status without active disease. Confirm the subtype is not better captured by a more specific leukemia code.
Do not use for
Do not use it for active leukemia, relapse, or unspecified leukemia status. Check documentation if remission is not explicitly stated or if the diagnosis belongs to a different leukemia category.
Coding tip
Code remission only when the provider documents it clearly; otherwise, query or check documentation.