ICD-10 Code C91.01 – Acute lymphoblastic leukemia, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C91.01 – Acute lymphoblastic leukemia, in remission
What it is
C91.01 identifies acute lymphoblastic leukemia that is currently in remission. Use it when the leukemia remains a documented diagnosis, but active disease is not present.
Clinical signs
Clinical features vary; refer to documentation. Remission generally means there is no evidence of active leukemia on the current record, though the patient may still have a history of ALL and ongoing follow-up.
When to use this code
Use this code when the provider documents acute lymphoblastic leukemia as being in remission, including during surveillance visits or after completion of therapy. It also fits follow-up encounters when the condition is still relevant to care and documentation supports remission status.
Do not use for
Do not use C91.01 for active acute lymphoblastic leukemia or when remission is not documented. If the chart only states a history of leukemia without current status, check documentation.
Coding tip
Code remission only when the provider clearly documents it; otherwise, query or check documentation before assigning C91.01.