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ICD-10-CM 2027 diagnosis code

C93.1Chronic myelomonocytic leukemia

Not billable — use a more specific code

C93.1 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C93.1

C93.1 is the ICD-10-CM diagnosis code for chronic myelomonocytic leukemia. It belongs to category C93 (monocytic leukemia), block C81-C96 (malignant neoplasms of lymphoid, hematopoietic and related tissue) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within C93 (monocytic leukemia), C93.1 is specifically for chronic myelomonocytic leukemia. Related codes cover acute monoblastic/monocytic leukemia (C93.0), juvenile myelomonocytic leukemia (C93.3), unspecified (C93.9) and other monocytic leukemia (C93.Z).

To report this condition, pick the subcode that matches the documentation: C93.10 (not having achieved remission), C93.11 (in remission) and C93.12 (in relapse).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C93.1

Coding notes

Applicable toConditions and synonyms classified to this code
  • Chronic monocytic leukemia
  • CMML-1
  • CMML-2
  • CMML with eosinophilia
Code alsoTwo codes may be needed; sequencing depends on circumstances
  • , if applicable, eosinophilia (D72.18)

Notes that apply from higher levels

Instructions written at a parent level also apply to C93.1.

› From C93 Monocytic leukemia
Includes
  • monocytoid leukemia
Excludes1
  • personal history of leukemia (Z85.6)

Broader instructions also apply from C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue and Chapter 2: Neoplasms.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to C93.1.

Codes whose notes reference C93.1

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C93.1

Is C93.1 billable?

No. C93.1 is a header code. Report one of its more specific subcodes instead.