All ICD10 Codes

C91.4

Non-Billable
ChapterC00–D49
Ranksubcategory
Official Description

Hairy cell leukemia

Use a more specific code (3 billable)
C91.40Hairy cell leukemia not having achieved remissionC91.41Hairy cell leukemia, in remissionC91.42Hairy cell leukemia, in relapse
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 2: Neoplasms (C00-D49).

Instructional Notes

Includes
  • Leukemic reticuloendotheliosis
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
C91.4Hairy cell leukemiaNot billable
C91.40Hairy cell leukemia not having achieved remissionBillable
C91.41Hairy cell leukemia, in remissionBillable
C91.42Hairy cell leukemia, in relapseBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to C91.4:

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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