All ICD10 Codes

C91.1

Non-Billable
ChapterC00–D49
Ranksubcategory
Official Description

Chronic lymphocytic leukemia of B-cell type

Use a more specific code (3 billable)
C91.10Chronic lymphocytic leukemia of B-cell type not having achieved remissionC91.11Chronic lymphocytic leukemia of B-cell type in remissionC91.12Chronic lymphocytic leukemia of B-cell type in relapse
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 2: Neoplasms (C00-D49).

Instructional Notes

Includes
  • Lymphoplasmacytic leukemia
  • Richter syndrome
Excludes1(Not coded here. Use a different code.)
  • lymphoplasmacytic lymphoma (C83.0-)
General instructions are available for the parent sections:
View C81-C96 NotesView C91 Notes

Clinical Hierarchy

BillableHas subcodes
CH2Neoplasms (C00-D49)
C81-C96Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
C91Lymphoid leukemia
C91.1Chronic lymphocytic leukemia of B-cell typeNot billable
C91.10Chronic lymphocytic leukemia of B-cell type not having achieved remissionBillable
C91.11Chronic lymphocytic leukemia of B-cell type in remissionBillable
C91.12Chronic lymphocytic leukemia of B-cell type in relapseBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to C91.1:

categoryC91
Lymphoid leukemia
View context instructions
blockC81-C96
Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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