C91

Lymphoid leukemia

Non-billable header

C91 is a non-billable header code. Use one of the more specific codes below.

Inclusion terms

Includes

  • Note: Functional activity
  • Note: 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.
  • Note: Morphology [Histology]
  • Note: 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.
  • Note: Primary malignant neoplasms overlapping site boundaries
  • Note: 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.
  • Note: Malignant neoplasm of ectopic tissue
  • Note: 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).

Excludes1

Not coded here — never report together with this code.

  • personal history of leukemia (Z85.6)

Excludes2

Not included here — may be reported together when both conditions exist.

  • 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)

More specific codes C91

  • C91.0Acute lymphoblastic leukemia [ALL]Header
  • C91.1Chronic lymphocytic leukemia of B-cell typeHeader
  • C91.3Prolymphocytic leukemia of B-cell typeHeader
  • C91.4Hairy cell leukemiaHeader
  • C91.5Adult T-cell lymphoma/leukemia (HTLV-1-associated)Header
  • C91.6Prolymphocytic leukemia of T-cell typeHeader
  • C91.AMature B-cell leukemia Burkitt-typeHeader
  • C91.ZOther lymphoid leukemiaHeader
  • C91.9Lymphoid leukemia, unspecifiedHeader

Related codes

  • C81Hodgkin lymphomaHeader
  • C82Follicular lymphomaHeader
  • C83Non-follicular lymphomaHeader
  • C84Mature T/NK-cell lymphomasHeader
  • C85Other specified and unspecified types of non-Hodgkin lymphomaHeader
  • C86Other specified types of T/NK-cell lymphomaHeader
  • C88Malignant immunoproliferative diseases and certain other B-cell lymphomasHeader
  • C90Multiple myeloma and malignant plasma cell neoplasmsHeader
  • C92Myeloid leukemiaHeader
  • C93Monocytic leukemiaHeader
  • C94Other leukemias of specified cell typeHeader
  • C95Leukemia of unspecified cell typeHeader
  • C96Other and unspecified malignant neoplasms of lymphoid, hematopoietic and related tissueHeader

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