U.S. ICD-10-CM · FY 2027

C84.1 ICD-10-CM Code: Sézary disease

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

C84.1

Sézary disease

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

Classification

Where C84.1 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 C84.1

    Sézary disease

More specific choices

Codes under C84.1

C84.1 is a non-billable category. Choose the child code that best matches the documented diagnosis.

C84.10

Sézary disease, unspecified site

C84.11

Sézary disease, lymph nodes of head, face, and neck

C84.12

Sézary disease, intrathoracic lymph nodes

C84.13

Sézary disease, intra-abdominal lymph nodes

C84.14

Sézary disease, lymph nodes of axilla and upper limb

C84.15

Sézary disease, lymph nodes of inguinal region and lower limb

C84.16

Sézary disease, intrapelvic lymph nodes

C84.17

Sézary disease, spleen

C84.18

Sézary disease, lymph nodes of multiple sites

C84.19

Sézary disease, extranodal and solid organ sites

C84.1A

Sézary disease, in remission

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for C84.1.

Code first

No “code first” instruction is listed for C84.1.

Use additional code

No “use additional code” instruction is listed for C84.1.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for C84.1.

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for C84.1.

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 C84.1 mean?

C84.1 is the FY 2027 U.S. ICD-10-CM code for “Sézary disease.”

Is C84.1 a billable or specific ICD-10-CM code?

No. C84.1 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 C84.1 located in ICD-10-CM?

C84.1 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 C84.1?

No inclusion terms are listed for C84.1 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.

Keep exploring

Related C84 codes

C84.0

Mycosis fungoides

C84.4

Peripheral T-cell lymphoma, not elsewhere classified

C84.6

Anaplastic large cell lymphoma, ALK-positive

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