C84.12 – Sezary disease, intrathoracic lymph nodes
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lymphoid, hematopoietic and related tissue
ICD-10-CM code
C84.12
- Code
C84.12(claims format:C8412)- Description
- Sezary disease, intrathoracic lymph nodes
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue
- Parent codes
- C84 › C84.1
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C84 – Mature T/NK-cell lymphomas
Excludes1 (not coded here):
- personal history of non-Hodgkin lymphoma (Z85.72)
Block C81-C96
Related codes in C84.1
- C84.10 – Sezary disease, unspecified siteBillable
- C84.11 – Sezary disease, lymph nodes of head, face, and neckBillable
- C84.13 – Sezary disease, intra-abdominal lymph nodesBillable
- C84.14 – Sezary disease, lymph nodes of axilla and upper limbBillable
- C84.15 – Sezary disease, lymph nodes of inguinal region and lower limbBillable
- C84.16 – Sezary disease, intrapelvic lymph nodesBillable
- C84.17 – Sezary disease, spleenBillable
- C84.18 – Sezary disease, lymph nodes of multiple sitesBillable
- C84.19 – Sezary disease, extranodal and solid organ sitesBillable
- C84.1A – Sezary disease, in remissionBillable
Frequently asked questions
What is ICD-10 code C84.12?
C84.12 is the ICD-10-CM code for sezary disease, intrathoracic lymph nodes, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).
Is C84.12 a billable code?
Yes. C84.12 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does C84.12 belong to?
It belongs to category C84 – Mature T/NK-cell lymphomas.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.