C91.Z0 – Other lymphoid leukemia not having achieved remission

ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lymphoid, hematopoietic and related tissue

Billable code

ICD-10-CM code C91.Z0
Code
C91.Z0 (claims format: C91Z0)
Description
Other lymphoid leukemia not having achieved remission
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
2. Neoplasms (C00-D49)
Block
C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue
Parent codes
C91 › C91.Z

Notes for C91.Z0

Applicable to:
  • Other lymphoid leukemia with failed remission
  • Other lymphoid leukemia NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

C91 – Lymphoid leukemia

Excludes1 (not coded here):
  • personal history of leukemia (Z85.6)

C91.Z – Other lymphoid leukemia

Applicable to:
  • T-cell large granular lymphocytic leukemia (associated with rheumatoid arthritis)

Block C81-C96

Excludes2 (not included here):
  • 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)

Related codes in C91.Z

Frequently asked questions

What is ICD-10 code C91.Z0?

C91.Z0 is the ICD-10-CM code for other lymphoid leukemia not having achieved remission, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).

Is C91.Z0 a billable code?

Yes. C91.Z0 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does C91.Z0 belong to?

It belongs to category C91 – Lymphoid leukemia.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.