2019 ICD-10-CM Diagnosis Code C91.5

Adult T-cell lymphoma/leukemia (HTLV-1-associated)

    2016 2017 2018 2019 Non-Billable/Non-Specific Code
  • C91.5 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2019 edition of ICD-10-CM C91.5 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of C91.5 - other international versions of ICD-10 C91.5 may differ.
Applicable To
  • Acute variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
  • Chronic variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
  • Lymphomatoid variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
  • Smouldering variant of adult T-cell lymphoma/leukemia (HTLV-1-associated)
The following code(s) above C91.5 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C91.5:
  • C00-D49
    2019 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • Functional activity
    • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
    • Morphology [Histology]
    • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
    • Primary malignant neoplasms overlapping site boundaries
    • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
    • Malignant neoplasm of ectopic tissue
    • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
    Neoplasms
  • C81-C96
    2019 ICD-10-CM Range C81-C96

    Malignant neoplasms of lymphoid, hematopoietic and related tissue

    Type 2 Excludes
    • Kaposi's sarcoma of lymph nodes (C46.3)
    • secondary and unspecified neoplasm of lymph nodes (C77.-)
    • secondary neoplasm of bone marrow (C79.52)
    • secondary neoplasm of spleen (C78.89)
    Malignant neoplasms of lymphoid, hematopoietic and related tissue
  • C91
    ICD-10-CM Diagnosis Code C91

    Lymphoid leukemia

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • personal history of leukemia (Z85.6)
    Lymphoid leukemia
Clinical Information
  • A peripheral (mature) t-cell neoplasm caused by the human t-cell leukemia virus type 1 (htlv-1). Adult t-cell leukemia/lymphoma is endemic in several regions of the world, in particular japan, the caribbean, and parts of central africa. (who, 2001)
  • Aggressive t-cell malignancy with adult onset, caused by human t lymphotropic virus type 1.
  • Aggressive t-cell malignancy with adult onset, caused by human t-lymphotropic virus 1. It is endemic in japan, the caribbean basin, southeastern United States, hawaii, and parts of central and south america and sub-saharan africa.
  • An aggressive (fast-growing) type of t-cell non-hodgkin lymphoma caused by the human t-cell leukemia virus type 1 (htlv-1). It is marked by bone and skin lesions, high calcium levels, and enlarged lymph nodes, spleen, and liver.
  • Atll. A cancer of t-cells (a type of white blood cell). It is often associated with human t-cell leukemia virus (htlv) infection.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change

Diagnosis Index entries containing back-references to C91.5:
  • Leukemia, leukemic C95.9-
    ICD-10-CM Diagnosis Code C95.9-

    Leukemia, unspecified

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    • adult T-cell C91.5- (HTLV-1-associated) (acute variant) (chronic variant) (lymphomatoid variant) (smouldering variant)
  • Lymphoma (of) (malignant) C85.90
    ICD-10-CM Diagnosis Code C85.90

    Non-Hodgkin lymphoma, unspecified, unspecified site

      2016 2017 2018 2019 Billable/Specific Code
    • adult T-cell C91.5- (HTLV-1-associated) (acute variant) (chronic variant) (lymphomatoid variant) (smouldering variant)

ICD-10-CM Codes Adjacent To C91.5
C91.11 …… in remission
C91.12 …… in relapse
C91.3 Prolymphocytic leukemia of B-cell type
C91.30 …… not having achieved remission
C91.31 …… in remission
C91.32 …… in relapse
C91.4 Hairy cell leukemia
C91.40 …… not having achieved remission
C91.41 …… in remission
C91.42 …… in relapse
C91.5 Adult T-cell lymphoma/leukemia (HTLV-1-associated)
C91.50 …… not having achieved remission
C91.51 …… in remission
C91.52 …… in relapse
C91.6 Prolymphocytic leukemia of T-cell type
C91.60 …… not having achieved remission
C91.61 …… in remission
C91.62 …… in relapse
C91.A Mature B-cell leukemia Burkitt-type
C91.A0 …… not having achieved remission
C91.A1 …… in remission

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.