ICD-10 Code C91.11 – Chronic lymphocytic leukemia of B-cell type in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C91.11 – Chronic lymphocytic leukemia of B-cell type in remission
What it is
This code identifies chronic lymphocytic leukemia (CLL) of B-cell type that is no longer showing active disease after treatment. Use it when the record clearly states remission.
Clinical signs
Clinical features vary; refer to documentation. Patients may have a history of CLL with prior treatment and current remission status noted by the clinician.
When to use this code
Use C91.11 when the provider documents B-cell CLL in remission, including follow-up visits after successful therapy. It is appropriate when the chart distinguishes remission from active or relapsed disease. Check documentation if remission status is unclear.
Do not use for
Do not use this code for active CLL, relapse, or unspecified leukemia status. If the note does not confirm remission, do not assume it.
Coding tip
Always code the current disease status exactly as documented, and query the provider if remission is not explicitly stated.