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ICD-10-CM Current in FY 2027

C91.42

Hairy cell leukemia, in relapse

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

Hierarchy

Where C91.42 sits in the official hierarchy. Each level is the code it is classified under.

  1. C91 Lymphoid leukemia
  2. C91.4 Parent Hairy cell leukemia
  3. C91.42 This code Hairy cell leukemia, in relapse

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.

Excludes1

personal history of leukemia ( Z85.6 )

Inherited from C91 — Lymphoid leukemia

Version History

How C91.42 appears in each release imported from the official files, newest first.

  1. FY 2027 Effective

    Current

    Hairy cell leukemia, in relapse

  2. FY 2026 Effective

    Unchanged

    Hairy cell leukemia, in relapse

Related Codes

Other codes under C91.4

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)

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