C91

Non-billable

Lymphoid leukemia

C91 is the ICD-10-CM code for Lymphoid leukemia. It is a non-billable category code — use a more specific child code such as C91.0 for billing.

Status
Header (non-billable)
Chapter
C00-D49
Subcodes
9
Edition
FY2026

C00-D49 Neoplasms

Excludes1 — not coded here

  • personal history of leukemia (Z85.6)

Frequently asked questions

What is ICD-10 code C91?
C91 is the ICD-10-CM code for "Lymphoid leukemia". It falls under C00-D49 Neoplasms.
Is C91 a billable code?
No — C91 is a non-billable header code. Use a more specific child code (such as C91.0) for billing.
What are the subcodes of C91?
C91 has 9 more specific child codes, including C91.0, C91.1, C91.3.
What is excluded from C91?
Excludes1 (not coded here): personal history of leukemia (Z85.6).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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