C91.00 ICD-10-CM Code: Acute lymphoblastic leukemia not having achieved remission
C91.00 is the billable ICD-10-CM code for “Acute lymphoblastic leukemia not having achieved remission” in the FY 2027 U.S. code set, effective Oct 1, 2026.
Official description
C91.00Acute lymphoblastic leukemia not having achieved remission
ICD-10-CM diagnosis code · United States clinical modification
Where C91.00 sits
- 1
Chapter 2
Neoplasms (C00-D49)
- 2
Section
Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
- 3
Category C91
Lymphoid leukemia
- 4
Subcategory C91.0
Acute lymphoblastic leukemia [ALL]
- 5
Code C91.00
Acute lymphoblastic leukemia not having achieved remission
Notes for this code
Inclusion terms
- Acute lymphoblastic leukemia with failed remission
- Acute lymphoblastic leukemia NOS
Code first
No “code first” instruction is listed for C91.00.
Use additional code
No “use additional code” instruction is listed for C91.00.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for C91.00.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for C91.00.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code C91.00 mean?
C91.00 is the FY 2027 U.S. ICD-10-CM code for “Acute lymphoblastic leukemia not having achieved remission.”
Is C91.00 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, C91.00 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is C91.00 located in ICD-10-CM?
C91.00 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96) (C81–C96), under category C91, Lymphoid leukemia and subcategory C91.0, Acute lymphoblastic leukemia [ALL].
What coding notes are listed for C91.00?
Its listed inclusion terms are Acute lymphoblastic leukemia with failed remission; Acute lymphoblastic leukemia NOS. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.