C84.9A
Mature T/NK-cell lymphomas, unspecified, in remission
Billable FY2026 2025-10-01 → 2026-09-30
FY2025–2027 only
This is the unspecified option. 10 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 2 never code together
Instructional notes 9
C84.9code
Inclusion terms
- NK/T cell lymphoma NOS
C00-D49chapter
Notes
- 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).C25.9
Index entries leading here 1
Alongside this code 10 same parent — C84.9
C84.90 Mature T/NK-cell lymphomas, unspecified, unspecified site C84.91 Mature T/NK-cell lymph, unsp, nodes of head, face, and neck C84.92 Mature T/NK-cell lymphomas, unsp, intrathoracic lymph nodes C84.93 Mature T/NK-cell lymphomas, unsp, intra-abd lymph nodes C84.94 Mature T/NK-cell lymph, unsp, nodes of axilla and upper limb C84.95 Mature T/NK-cell lymph, unsp, nodes of ing rgn and low limb C84.96 Mature T/NK-cell lymphomas, unsp, intrapelvic lymph nodes C84.97 Mature T/NK-cell lymphomas, unspecified, spleen C84.98 Mature T/NK-cell lymphomas, unsp, lymph nodes mult site C84.99 Mature T/NK-cell lymph, unsp, extrnod and solid organ sites
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.