C94.3Header code — not billable

Mast cell leukemia

Chapter
2. Neoplasms
Category
C94
Effective date
October 1, 2026

Related codes in category C94

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.