C91.1 is the ICD-10 code for Chronic lymphocytic leukaemia of B-cell type. It is a four-character subcategory of C91 (Lymphoid leukaemia), the most specific level in the WHO edition. It belongs to the block C81–C96 (Malignant neoplasms, stated or presumed to be primary, of lymphoid, haematopoietic and related tissue) in Chapter II, Neoplasms.
- Code type
- Subcategory (4 characters)
- Chapter
- II · C00–D48
- Classification
- WHO ICD-10, 2019 version
What C91.1 includes
Conditions and terms that are coded here.
- Lymphoplasmacytic leukaemia
- Richter syndrome
What C91.1 excludes
Conditions that look similar but belong under another code.
- lymphoplasmacytic lymphoma C83.0
C91.1 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
C91.1Kronisk lymfatisk leukemi
DC911Kronisk lymfatisk leukæmi af B-celle type (B-CLL)
- DC911ALymfoplasmacytær leukæmi
- DC911BRichter syndrom
C91.1Pitkäaikainen lymfosyyttileukemia
C91.1Chronische lymphatische Leukämie vom B-Zell-Typ [CLL]
C91.1Leucémie lymphoïde chronique à cellules B
C91.1chronische lymfatische leukemie van B-celtype
Listed through more specific codes:
- C91.10Chronic lymphocytic leukemia of B-cell type not having achieved remission
- C91.11Chronic lymphocytic leukemia of B-cell type in remission
- C91.12Chronic lymphocytic leukemia of B-cell type in relapse
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
Look up another code
Stop looking codes up by hand
Docdemic listens to the consultation, writes the note and suggests the diagnosis and procedure codes that fit it, each one checked against your country’s official code list.
Try Docdemic free