C84.9
Mature T/NK-cell lymphomas, unspecified
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C84.9 needs more characters to be billable. Pick the specific code below.
- C84.90Mature T/NK-cell lymphomas, unspecified, unspecified siteBillable
- C84.91Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neckBillable
- C84.92Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodesBillable
- C84.93Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodesBillable
- C84.94Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limbBillable
- C84.95Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limbBillable
- C84.96Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodesBillable
- C84.97Mature T/NK-cell lymphomas, unspecified, spleenBillable
- C84.98Mature T/NK-cell lymphomas, unspecified, lymph nodes of multiple sitesBillable
- C84.99Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sitesBillable
- C84.9AMature T/NK-cell lymphomas, unspecified, in remissionBillable
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
mature T-cell lymphoma, not elsewhere classified (C84.4-)
NK/T cell lymphoma NOS
personal history of non-Hodgkin lymphoma (Z85.72)
Functional activity All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm. Morphology [Histology] Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes. Primary malignant neoplasms overlapping site boundaries A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned. Malignant neoplasm of ectopic tissue Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9). (C00-C96) Malignant neoplasms (C00-C96) (C00-C75) Malignant neoplasms, stated or presumed to be primary (of specified sites), and certain specified histologies, except neuroendocrine, and of lymphoid, hematopoietic and related tissue (C00-C75)
Official Guidelines for C84.9
FY 2026 ›Subsections
- I.C.2.aAdmission/Encounter for treatment of primary site
- I.C.2.bAdmission/Encounter for treatment of secondary site
- I.C.2.cCoding and sequencing of complications
- I.C.2.dPrimary malignancy previously excised
- I.C.2.eAdmissions/Encounters involving antineoplastic chemotherapy, immunotherapy and radiation therapy
- I.C.2.fAdmission/encounter to determine extent of malignancy
- I.C.2.gSymptoms, signs, and abnormal findings listed in Chapter 18 associated with neoplasms
- I.C.2.hAdmission/encounter for pain control/management
- I.C.2.iMalignancy in two or more noncontiguous sites
- I.C.2.jDisseminated malignant neoplasm, unspecified
- I.C.2.kMalignant neoplasm without specification of site
- I.C.2.lSequencing of neoplasm codes
- I.C.2.mCurrent malignancy versus personal history of malignancy
- I.C.2.nLeukemia, Multiple Myeloma, and Malignant Plasma Cell
- I.C.2.oAftercare following surgery for neoplasm
- I.C.2.pFollow-up care for completed treatment of a malignancy
- I.C.2.qProphylactic organ removal for prevention of malignancy
- I.C.2.rMalignant neoplasm associated with transplanted organ
- I.C.2.sBreast Implant Associated Anaplastic Large Cell Lymphoma
- I.C.2.tSecondary malignant neoplasm of lymphoid tissue
Sections that reference C84.9
- I.C.2.sBreast Implant Associated Anaplastic Large Cell Lymphoma
… Assign code C84.7A, Anaplastic large cell lymphoma, ALK-negative, breast, for BIA-ALCL or C84.7B, Anaplastic large cell lymphoma, ALK-negative, …
- I.C.2.tSecondary malignant neoplasm of lymphoid tissue
When a malignant neoplasm of lymphoid tissue metastasizes beyond the lymph nodes, a code from categories C81-C85 with a final character identifying “extranodal and solid organ sites” should be assigned rather than a code for the secondary …
Sections whose FY 2026 text names C84.9, its C84 category, or a range containing it — the chapter guidance above is the authoritative source.