C93.1 – Chronic myelomonocytic leukemia

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

Non-billable header

ICD-10-CM code C93.1

Code: C93.1 (claims format: C931)
Description: Chronic myelomonocytic leukemia
Billable: No – use a more specific code below
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: C93

Billable codes under C93.1

C93.1 is a header code and cannot be used on claims. Choose the most specific code:

Notes for C93.1

Applicable to:

Chronic monocytic leukemia
CMML-1
CMML-2
CMML with eosinophilia

Code also:

, if applicable, eosinophilia (D72.18)

Notes inherited from parent codes

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

C93 – Monocytic leukemia

Includes:

monocytoid leukemia

Excludes1 (not coded here):

personal history of leukemia (Z85.6)

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)

Index terms for C93.1

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in C93

Frequently asked questions

What is ICD-10 code C93.1?

C93.1 is the ICD-10-CM code for chronic myelomonocytic leukemia, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).

Is C93.1 a billable code?

No. C93.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does C93.1 belong to?

It belongs to category C93 – Monocytic 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.