C84.99 – Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lymphoid, hematopoietic and related tissue
ICD-10-CM code
C84.99
- Code
C84.99(claims format:C8499)- Description
- Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
- Short description
- Mature T/NK-cell lymph, unsp, extrnod and solid organ sites
- 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 › C84.9
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)
C84.9 – Mature T/NK-cell lymphomas, unspecified
Applicable to:
- NK/T cell lymphoma NOS
Excludes1 (not coded here):
- mature T-cell lymphoma, not elsewhere classified (C84.4-)
Block C81-C96
Related codes in C84.9
- C84.90 – Mature T/NK-cell lymphomas, unspecified, unspecified siteBillable
- C84.91 – Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neckBillable
- C84.92 – Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodesBillable
- C84.93 – Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodesBillable
- C84.94 – Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limbBillable
- C84.95 – Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limbBillable
- C84.96 – Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodesBillable
- C84.97 – Mature T/NK-cell lymphomas, unspecified, spleenBillable
- C84.98 – Mature T/NK-cell lymphomas, unspecified, lymph nodes of multiple sitesBillable
- C84.9A – Mature T/NK-cell lymphomas, unspecified, in remissionBillable
Frequently asked questions
What is ICD-10 code C84.99?
C84.99 is the ICD-10-CM code for mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).
Is C84.99 a billable code?
Yes. C84.99 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does C84.99 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.