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C91.6

C91.6: Prolymphocytic leukemia of T-cell type

Non-billable headerICD-10-CM

C91.6 is a non-billable header ICD-10-CM code for prolymphocytic leukemia of t-cell type. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above C91.6

A category’s note binds every code beneath it.

Written on C91: Lymphoid leukemia

  • personal history of leukemia (Z85.6)

Other codes that can never be billed with C91.6

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

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 C91.6

3 child codes. Green means billable.

Other codes under C91

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.