C91 Lymphoid leukemia

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Lymphoid leukemia is C91 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
C81-C96: Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
Category C91
37 codes (27 billable)
FY2026 Status
Stable since FY2024
Excludes1
Not coded here. These conditions should NOT be coded together with C91.
  • personal history of leukemia (Z85.6)

Official Coding Guidelines

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.2.a
Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.2.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Cite This Page

Reference C91 with the canonical source and edition:

C91 — Lymphoid leukemia. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C91

Canonical URL: https://icd10codingpro.com/codes/C91

Related Codes

More Specific Codes

C91.0 Acute lymphoblastic leukemia [ALL] C91.1 Chronic lymphocytic leukemia of B-cell type C91.3 Prolymphocytic leukemia of B-cell type C91.4 Hairy cell leukemia C91.5 Adult T-cell lymphoma/leukemia (HTLV-1-associated) C91.6 Prolymphocytic leukemia of T-cell type C91.9 Lymphoid leukemia, unspecified C91.A Mature B-cell leukemia Burkitt-type C91.Z Other lymphoid leukemia

All Codes in C91

Every most-specific code under C91 Lymphoid leukemia (27 codes):

Show the complete C91 code list
C91.00 Acute lymphoblastic leukemia not having achieved remission C91.01 Acute lymphoblastic leukemia, in remission C91.02 Acute lymphoblastic leukemia, in relapse 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 C91.30 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 C91.40 Hairy cell leukemia not having achieved remission C91.41 Hairy cell leukemia, in remission C91.42 Hairy cell leukemia, in relapse 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 C91.60 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 C91.90 Lymphoid leukemia, unspecified not having achieved remission C91.91 Lymphoid leukemia, unspecified, in remission C91.92 Lymphoid leukemia, unspecified, in relapse 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.Z0 Other lymphoid leukemia not having achieved remission C91.Z1 Other lymphoid leukemia, in remission C91.Z2 Other lymphoid leukemia, in relapse
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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