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ICD-10-CM 2027

ICD-10 code for acute lymphoblastic leukemia

C91.0

Acute lymphoblastic leukemia [ALL]

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Leukemia, leukemic › acute lymphoblastic”. Page updated September 29, 2026.

About coding acute lymphoblastic leukemia

The ICD-10-CM code for acute lymphoblastic leukemia is C91.0 (Acute lymphoblastic leukemia [ALL]).

Within C91 (lymphoid leukemia), C91.0 is specifically for acute lymphoblastic leukemia [ALL]. Related codes cover chronic lymphocytic leukemia of B-cell type (C91.1), Prolymphocytic leukemia of B-cell type (C91.3), Hairy cell leukemia (C91.4), adult T-cell lymphoma/leukemia (HTLV-1-associated) (C91.5), Prolymphocytic leukemia of T-cell type (C91.6), unspecified (C91.9), mature B-cell leukemia Burkitt-type (C91.A) and other lymphoid leukemia (C91.Z).

To report this condition, pick the subcode that matches the documentation: C91.00 (remission), C91.01 (remission) and C91.02 (relapse).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about acute lymphoblastic leukemia ICD-10 codes

What is the ICD-10 code for acute lymphoblastic leukemia?

C91.0 — Acute lymphoblastic leukemia [ALL] (a header code; report a more specific subcode).

Is C91.0 billable?

No. C91.0 is a header code. Report one of its more specific subcodes instead.