T-cell leukemia

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ICD10 Diagnosis
Dx: T-cell leukemia
ICD10 code: C91.5
Pre-ICD10 counterpart: none assigned
Charlson/ALERT Scale: Any malignancy, including lymphoma and leukemia, except of skin
APACHE Como Component: Immunocompromised
APACHE Acute Component: none
Start Date:
Stop Date:
External ICD10 Documentation

This diagnosis is a part of ICD10 collection.

  • SMW
    • 2019-01-01
    • 2999-12-31
    • C91.5
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Additional Info

  • T-cell leukemia describes several different types of lymphoid leukemia which affect T cells.
    • Types include:
      • Large granular lymphocytic leukemia
      • Adult T-cell leukemia/lymphoma
      • T-cell prolymphocytic leukemia

Excludes:

Leukemia vs Lymphoma

Any lymphoma may have a leukemic phase where the abnormal clonal cells appear in the circulation. Though this is sometimes referred to as a "leukemia", even by some oncologists, that is technically incorrect and ICD10 considers them to be lymphomas. This applies to essentially ALL so-called B-cell leukemias, which are actually lymphomas. It also applies to "NK-cell leukemia" which is also a lymphoma

As such, the following so-called "leukemias" should be coded as follows:

  • So-called B-cell leukemias describes several different types of lymphoid lymphomas which affect B cells -- and all these should be coded as Lymphoma, NOS
    • "B cell chronic lymphocytic leukemia"
    • "Precursor B cell lymphoblastic leukemia"
    • "Acute Lymphoblastic leukemia, mature B cell type"
    • "B cell prolymphocytic leukemia"
  • So-called "NK-cell leukemia" -- code as T-cell lymphoma
    • Aggressive NK-cell leukemia (also called aggressive NK-cell lymphoma, or ANKL), is a very rare type of NHL. The body makes large numbers of NK cells that are larger than normal. It is grouped with T-cell lymphomas.
    • There is a very rare slow-growing (indolent) type of NK-cell leukemia that has a more favorable prognosis. It is called chronic NK-cell leukemia and is treated like T-cell large granular lymphocytic leukemia.
  • The most common type of lymphoid leukemia is B-cell chronic lymphocytic leukemia.

Alternate ICD10s to consider coding instead or in addition

Leukemia codes:

Candidate Combined ICD10 codes

Related CCI Codes

Data Integrity Checks (automatic list)

none found

Related Articles

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