C94.3Header code — not billable
Mast cell leukemia
- Chapter
- 2. Neoplasms
- Category
- C94
- Effective date
- October 1, 2026
Related codes in category C94
C94Other leukemias of specified cell typeC94.0Acute erythroid leukemiaC94.00Acute erythroid leukemia, not having achieved remissionYesC94.01Acute erythroid leukemia, in remissionYesC94.02Acute erythroid leukemia, in relapseYesC94.2Acute megakaryoblastic leukemiaC94.20Acute megakaryoblastic leukemia not achieve remissionYesC94.21Acute megakaryoblastic leukemia, in remissionYesC94.22Acute megakaryoblastic leukemia, in relapseYesC94.30Mast cell leukemia not having achieved remissionYesC94.31Mast cell leukemia, in remissionYesC94.32Mast cell leukemia, in relapseYes
Frequently asked questions
What is ICD-10 code C94.3?
C94.3 is an ICD-10-CM diagnosis code for Mast cell leukemia.
Is C94.3 a billable code?
No. C94.3 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is C94.3 in?
C94.3 falls under Chapter 2: Neoplasms.
When did C94.3 become effective?
C94.3 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to C94.3?
C94.3 belongs to category C94, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.