C84.AHeader code — not billable
Cutaneous T-cell lymphoma, unspecified
- Chapter
- 2. Neoplasms
- Category
- C84
- Effective date
- October 1, 2026
Related codes in category C84
C84Mature T/NK-cell lymphomasC84.0Mycosis fungoidesC84.00Mycosis fungoides, unspecified siteYesC84.01Mycosis fungoides, lymph nodes of head, face, and neckYesC84.02Mycosis fungoides, intrathoracic lymph nodesYesC84.03Mycosis fungoides, intra-abdominal lymph nodesYesC84.04Mycosis fungoides, lymph nodes of axilla and upper limbYesC84.05Mycosis fungoides, nodes of inguinal region and lower limbYesC84.06Mycosis fungoides, intrapelvic lymph nodesYesC84.07Mycosis fungoides, spleenYesC84.08Mycosis fungoides, lymph nodes of multiple sitesYesC84.09Mycosis fungoides, extranodal and solid organ sitesYes
Frequently asked questions
What is ICD-10 code C84.A?
C84.A is an ICD-10-CM diagnosis code for Cutaneous T-cell lymphoma, unspecified.
Is C84.A a billable code?
No. C84.A is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is C84.A in?
C84.A falls under Chapter 2: Neoplasms.
When did C84.A become effective?
C84.A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to C84.A?
C84.A belongs to category C84, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.