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C94.3

C94.3: Mast cell leukemia

Non-billable headerICD-10-CM

C94.3 is a non-billable header ICD-10-CM code for mast cell leukemia. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above C94.3

A category’s note binds every code beneath it.

Written on C94: Other leukemias of specified cell type

  • leukemic reticuloendotheliosis (C91.4-)
  • myelodysplastic syndromes (D46.-)
  • personal history of leukemia (Z85.6)
  • plasma cell leukemia (C90.1-)

Other codes that can never be billed with C94.3

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • C96.2Malignant mast cell neoplasm
  • D47.02Systemic mastocytosis
  • D89.4Mast cell activation syndrome and related disorders
  • D72.825Bandemia

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead C94.3

3 child codes. Green means billable.

Other codes under C94

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.