C84.9
C84.9: Mature T/NK-cell lymphomas, unspecified
Non-billable headerICD-10-CM
C84.9 is a non-billable header ICD-10-CM code for mature t/nk-cell lymphomas, unspecified. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- mature T-cell lymphoma, not elsewhere classified (C84.4-)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- NK/T cell lymphoma NOS
Other codes that can never be billed with C84.9
Their own Excludes1 notes name this code, so the conflict is not listed above.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead C84.9
11 child codes. Green means billable.
- C84.90Mature T/NK-cell lymphomas, unspecified, unspecified site
- C84.91Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck
- C84.92Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes
- C84.93Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes
- C84.94Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limb
- C84.95Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limb
- C84.96Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes
- C84.97Mature T/NK-cell lymphomas, unspecified, spleen
- C84.98Mature T/NK-cell lymphomas, unspecified, lymph nodes of multiple sites
- C84.99Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
- C84.9AMature T/NK-cell lymphomas, unspecified, in remission