ICD-10-CM C91: Lymphoid leukemia

ICD-10-CM Diagnosis Code (2025)

Official Description for C91

Lymphoid leukemia

Coding Notes & Guidelines for C91

Excludes1: Not Coded Here

personal history of leukemia (Z85.6)

Excludes1: Not Coded Here

lymphoplasmacytic lymphoma (C83.0-)

Excludes1: Not Coded Here

Burkitt lymphoma (C83.7-)

Inclusion Terms
  • Acute lymphoblastic leukemia with failed remission
  • Acute lymphoblastic leukemia NOS
Inclusion Terms
  • Lymphoplasmacytic leukemia
  • Richter syndrome
Inclusion Terms
  • Chronic lymphocytic leukemia of B-cell type with failed remission
  • Chronic lymphocytic leukemia of B-cell type NOS
Inclusion Terms
  • Prolymphocytic leukemia of B-cell type with failed remission
  • Prolymphocytic leukemia of B-cell type NOS
Inclusion Terms

Leukemic reticuloendotheliosis

Inclusion Terms
  • Hairy cell leukemia with failed remission
  • Hairy cell leukemia NOS
Inclusion Terms
  • 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)
Inclusion Terms
  • Adult T-cell lymphoma/leukemia (HTLV-1-associated) with failed remission
  • Adult T-cell lymphoma/leukemia (HTLV-1-associated) NOS
Inclusion Terms
  • Prolymphocytic leukemia of T-cell type with failed remission
  • Prolymphocytic leukemia of T-cell type NOS
Inclusion Terms
  • Mature B-cell leukemia Burkitt-type with failed remission
  • Mature B-cell leukemia Burkitt-type NOS
Inclusion Terms

T-cell large granular lymphocytic leukemia (associated with rheumatoid arthritis)

Inclusion Terms
  • Other lymphoid leukemia with failed remission
  • Other lymphoid leukemia NOS
Inclusion Terms
  • Lymphoid leukemia with failed remission
  • Lymphoid leukemia NOS

Child Codes (More Specific Codes for C91):

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

About ICD-10-CM Code C91 (Lymphoid leukemia)

ICD-10-CM code C91 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM C91 became effective on October 1, 2024.

This page provides detailed information about C91 - Lymphoid leukemia. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Lymphoid leukemia.