ICD-10-CM 2027 diagnosis code
C94.3Mast cell leukemia
C94.3 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 C94.3
C94.3 is the ICD-10-CM diagnosis code for mast cell leukemia. It belongs to category C94 (other leukemias of specified cell type), 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 C94 (other leukemias of specified cell type), C94.3 is specifically for mast cell leukemia. Related codes cover acute erythroid leukemia (C94.0), acute megakaryoblastic leukemia (C94.2), acute panmyelosis with myelofibrosis (C94.4), myelodysplastic disease, not elsewhere classified (C94.6) and other specified leukemias (C94.8).
To report this condition, pick the subcode that matches the documentation: C94.30 (not having achieved remission), C94.31 (in remission) and C94.32 (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 C94.3
Notes that apply from higher levels
Instructions written at a parent level also apply to C94.3.
Broader instructions also apply from C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue and Chapter 2: Neoplasms.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to C94.3.
Codes whose notes reference C94.3
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about C94.3
Is C94.3 billable?
- No. C94.3 is a header code. Report one of its more specific subcodes instead.