C84.9 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Mature T/NK-cell lymphomas, unspecified.
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NK/T cell lymphoma NOS
Mature T-cell lymphoma, not elsewhere classified (C84.4-)
Mature T/NK-cell lymphomas, unspecified, unspecified site
Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck
Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes
Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes
Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limb
Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limb
Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes
Mature T/NK-cell lymphomas, unspecified, spleen
Mature T/NK-cell lymphomas, unspecified, lymph nodes of multiple sites
Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
Mature T/NK-cell lymphomas, unspecified, in remission
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