Is C94 a billable ICD-10-CM code?

No. C94 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does C94 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96).

What cannot be coded together with C94?

C94 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

C94

C94 — Other leukemias of specified cell type

Non-billable headerICD-10-CM

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

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

These codes carry an Excludes1 note pointing at C94. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C94 alone.

D72.825Bandemia
C96.2Malignant mast cell neoplasm
D64.4Congenital dyserythropoietic anemia
D47.02Systemic mastocytosis
D47.4Osteomyelofibrosis
D53.1Other megaloblastic anemias, not elsewhere classified
D75.81Myelofibrosis
D89.4Mast cell activation syndrome and related disorders

Risk adjustment

C94 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead C94

6 child codes. Green means billable.

Questions about C94

Is C94 a billable ICD-10-CM code?: No. C94 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does C94 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96).
What cannot be coded together with C94?: C94 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.