MedCodeSearch
ICD-10-CM Current in FY 2027

C91.1

Chronic lymphocytic leukemia of B-cell type

Release
FY 2027
Effective
Official source (opens in a new tab)

Hierarchy

Where C91.1 sits in the official hierarchy. Each level is the code it is classified under.

  1. C91 Parent Lymphoid leukemia
  2. C91.1 This code Chronic lymphocytic leukemia of B-cell type

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

Inclusion Terms

Lymphoplasmacytic leukemia

Inclusion Terms

Richter syndrome

Excludes1

personal history of leukemia ( Z85.6 )

Inherited from C91 — Lymphoid leukemia

Excludes1

lymphoplasmacytic lymphoma ( C83.0- )

More Specific Codes

3 codes under C91.1

Version History

How C91.1 appears in each release imported from the official files, newest first.

  1. FY 2027 Effective

    Current

    Chronic lymphocytic leukemia of B-cell type

  2. FY 2026 Effective

    Unchanged

    Chronic lymphocytic leukemia of B-cell type

Related Codes

Other codes under C91

Codes whose official notes reference C91.1

Data Source

Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.

Release
FY 2027
Effective
Source file
icd10cm-code-descriptions-2027.zip

Official ICD-10-CM source files (opens in a new tab)

MedCodeSearch is an independent reference service and is not affiliated with CMS, CDC, or the U.S. government.

Look up another code

Search ICD-10-CM, ICD-10-PCS and HCPCS Level II by code or description.