U.S. ICD-10-CM · FY 2027

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.

Code definition

Official description

C84

Mature T/NK-cell lymphomas

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where C84 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)

  3. 3

    Category C84

    Mature T/NK-cell lymphomas

  4. 4

    Code C84

    Mature T/NK-cell lymphomas

More specific choices

Codes under C84

C84 is a non-billable category. Choose the child code that best matches the documented diagnosis.

C84.0

Mycosis fungoides

C84.1

Sézary disease

C84.4

Peripheral T-cell lymphoma, not elsewhere classified

C84.6

Anaplastic large cell lymphoma, ALK-positive

C84.7

Anaplastic large cell lymphoma, ALK-negative

C84.9

Mature T/NK-cell lymphomas, unspecified

C84.A

Cutaneous T-cell lymphoma, unspecified

C84.Z

Other mature T/NK-cell lymphomas

Documentation details

Notes 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.

Transparency

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.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

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.

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