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  2. ICD-10-CM Codes List
  3. C00–D49
  4. C81-C96
  5. Lymphoid leukemia (C91)

Lymphoid leukemia (C91)

The ICD-10 code section C91 is used specifically for diagnosing various types of lymphoid leukemia, a cancer of the white blood cells affecting lymphoid cell lines. This section includes detailed codes for specific forms such as acute lymphoblastic leukemia (ALL), chronic lymphocytic leukemia, and other variants, capturing their remission or relapse status.

This section helps medical coders accurately identify the exact type and stage of lymphoid leukemia. For instance, the code C91.0 refers to acute lymphoblastic leukemia, known by synonyms like B-cell acute lymphoblastic leukemia and T-lymphoblastic leukemia. Subcategories like C91.00 specify ALL not yet in remission, important for treatment tracking. Chronic lymphocytic leukemia of B-cell type is identified with C91.1, with related codes marking remission (C91.11) or relapse (C91.12). Other subtypes include hairy cell leukemia (C91.4) and adult T-cell lymphoma/leukemia (C91.5), with synonyms aiding in resolving clinical terminology. This detailed classification allows clinicians and coders to distinguish closely related leukemias and their clinical states using the ICD-10 codes for lymphoid leukemia.

  • Neoplasms (C00–D49)

    • Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)

        • Lymphoid leukemia (C91)

        • C91 Lymphoid leukemia
        • C91.0 Acute lymphoblastic leukemia [ALL]
        • C91.00 Acute lymphoblastic leukemia not having achieved remission
        • C91.01 Acute lymphoblastic leukemia, in remission
        • C91.02 Acute lymphoblastic leukemia, in relapse
        • C91.1 Chronic lymphocytic leukemia of B-cell type
        • C91.10 Chronic lymphocytic leukemia of B-cell type not having achieved remission
        • C91.11 Chronic lymphocytic leukemia of B-cell type in remission
        • C91.12 Chronic lymphocytic leukemia of B-cell type in relapse
        • C91.3 Prolymphocytic leukemia of B-cell type
        • C91.30 Prolymphocytic leukemia of B-cell type not having achieved remission
        • C91.31 Prolymphocytic leukemia of B-cell type, in remission
        • C91.32 Prolymphocytic leukemia of B-cell type, in relapse
        • C91.4 Hairy cell leukemia
        • C91.40 Hairy cell leukemia not having achieved remission
        • C91.41 Hairy cell leukemia, in remission
        • C91.42 Hairy cell leukemia, in relapse
        • C91.5 Adult T-cell lymphoma/leukemia (HTLV-1-associated)
        • C91.50 Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remission
        • C91.51 Adult T-cell lymphoma/leukemia (HTLV-1-associated), in remission
        • C91.52 Adult T-cell lymphoma/leukemia (HTLV-1-associated), in relapse
        • C91.6 Prolymphocytic leukemia of T-cell type
        • C91.60 Prolymphocytic leukemia of T-cell type not having achieved remission
        • C91.61 Prolymphocytic leukemia of T-cell type, in remission
        • C91.62 Prolymphocytic leukemia of T-cell type, in relapse
        • C91.9 Lymphoid leukemia, unspecified
        • C91.90 Lymphoid leukemia, unspecified not having achieved remission
        • C91.91 Lymphoid leukemia, unspecified, in remission
        • C91.92 Lymphoid leukemia, unspecified, in relapse
        • C91.A Mature B-cell leukemia Burkitt-type
        • C91.A0 Mature B-cell leukemia Burkitt-type not having achieved remission
        • C91.A1 Mature B-cell leukemia Burkitt-type, in remission
        • C91.A2 Mature B-cell leukemia Burkitt-type, in relapse
        • C91.Z Other lymphoid leukemia
        • C91.Z0 Other lymphoid leukemia not having achieved remission
        • C91.Z1 Other lymphoid leukemia, in remission
        • C91.Z2 Other lymphoid leukemia, in relapse

Instructional Notations

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • personal history of leukemia Z85.6