C84 ICD-10-CM Code: Mature T/NK-cell lymphomas
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
C84Mature T/NK-cell lymphomas
ICD-10-CM diagnosis code · United States clinical modification
Where C84 sits
- 1
Chapter 2
Neoplasms (C00-D49)
- 2
Section
Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
- 3
Category C84
Mature T/NK-cell lymphomas
- 4
Code C84
Mature T/NK-cell lymphomas
Codes under C84
C84 is a non-billable category. Choose the child code that best matches the documented diagnosis.
C84.0Mycosis fungoidesC84.1Sézary diseaseC84.4Peripheral T-cell lymphoma, not elsewhere classifiedC84.6Anaplastic large cell lymphoma, ALK-positiveC84.7Anaplastic large cell lymphoma, ALK-negativeC84.9Mature T/NK-cell lymphomas, unspecifiedC84.ACutaneous T-cell lymphoma, unspecifiedC84.ZOther mature T/NK-cell lymphomasNotes for this code
Inclusion terms
No inclusion terms are listed for C84.
Code first
No “code first” instruction is listed for C84.
Use additional code
No “use additional code” instruction is listed for C84.
Excludes1
Conditions that should not be reported together with this code.
- personal history of non-Hodgkin lymphoma (Z85.72)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for C84.
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 C84 mean?
C84 is the FY 2027 U.S. ICD-10-CM code for “Mature T/NK-cell lymphomas.”
Is C84 a billable or specific ICD-10-CM code?
No. C84 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is C84 located in ICD-10-CM?
C84 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96) (C81–C96), under category C84, Mature T/NK-cell lymphomas.
What coding notes are listed for C84?
No inclusion terms are listed for C84 in this reference record. No code-first instruction is listed. Excludes1 notes: personal history of non-Hodgkin lymphoma (Z85.72). No Excludes2 note is listed.