MCMedicalCodingSoftware
C84.A

C84.A: Cutaneous T-cell lymphoma, unspecified

Non-billable headerICD-10-CM

C84.A is a non-billable header ICD-10-CM code for cutaneous t-cell lymphoma, unspecified. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above C84.A

A category’s note binds every code beneath it.

Written on C84: Mature T/NK-cell lymphomas

  • personal history of non-Hodgkin lymphoma (Z85.72)

Other codes that can never be billed with C84.A

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

  • C86Other specified types of T/NK-cell lymphoma
  • C82Follicular lymphoma
  • C83.0Small cell B-cell lymphoma
  • C83.3Diffuse large B-cell lymphoma

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 C84.A

11 child codes. Green means billable.

Other codes under C84

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.