ICD-10-CM 2027 diagnosis code
C84Mature T/NK-cell lymphomas
Not billable — use a more specific code
C84 is a header code, so it can't be reported by itself. Choose one of the 8 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About C84
C84 is the ICD-10-CM diagnosis code for mature T/NK-cell lymphomas. It belongs to block C81-C96 (malignant neoplasms of lymphoid, hematopoietic and related tissue) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: C84.0 (fungoides), C84.1 (disease), C84.4 (classified), C84.6 (ALK-positive), C84.7 (ALK-negative), C84.9 (unspecified), C84.A (unspecified) and C84.Z (lymphomas).
Don't report C84 together with the conditions in its Excludes1 note: personal history of non-Hodgkin lymphoma (Z85.72).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under C84
- C84.0Mycosis fungoides
- C84.00Mycosis fungoides, unspecified siteBillable
- C84.01Mycosis fungoides, lymph nodes of head, face, and neckBillable
- C84.02Mycosis fungoides, intrathoracic lymph nodesBillable
- C84.03Mycosis fungoides, intra-abdominal lymph nodesBillable
- C84.04Mycosis fungoides, lymph nodes of axilla and upper limbBillable
- C84.05Mycosis fungoides, lymph nodes of inguinal region and lower limbBillable
- C84.06Mycosis fungoides, intrapelvic lymph nodesBillable
- C84.07Mycosis fungoides, spleenBillable
- C84.08Mycosis fungoides, lymph nodes of multiple sitesBillable
- C84.09Mycosis fungoides, extranodal and solid organ sitesBillable
- C84.0AMycosis fungoides, in remissionBillable
- C84.1Sezary disease
- C84.10Sezary disease, unspecified siteBillable
- C84.11Sezary disease, lymph nodes of head, face, and neckBillable
- C84.12Sezary disease, intrathoracic lymph nodesBillable
- C84.13Sezary disease, intra-abdominal lymph nodesBillable
- C84.14Sezary disease, lymph nodes of axilla and upper limbBillable
- C84.15Sezary disease, lymph nodes of inguinal region and lower limbBillable
- C84.16Sezary disease, intrapelvic lymph nodesBillable
- C84.17Sezary disease, spleenBillable
- C84.18Sezary disease, lymph nodes of multiple sitesBillable
- C84.19Sezary disease, extranodal and solid organ sitesBillable
- C84.1ASezary disease, in remissionBillable
- C84.4Peripheral T-cell lymphoma, not elsewhere classified
- C84.40Peripheral T-cell lymphoma, not elsewhere classified, unspecified siteBillable
- C84.41Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neckBillable
- C84.42Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodesBillable
- C84.43Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodesBillable
- C84.44Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of axilla and upper limbBillable
- C84.45Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of inguinal region and lower limbBillable
- C84.46Peripheral T-cell lymphoma, not elsewhere classified, intrapelvic lymph nodesBillable
- C84.47Peripheral T-cell lymphoma, not elsewhere classified, spleenBillable
- C84.48Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of multiple sitesBillable
- C84.49Peripheral T-cell lymphoma, not elsewhere classified, extranodal and solid organ sitesBillable
- C84.4APeripheral T-cell lymphoma, not elsewhere classified, in remissionBillable
- C84.6Anaplastic large cell lymphoma, ALK-positive
- C84.60Anaplastic large cell lymphoma, ALK-positive, unspecified siteBillable
- C84.61Anaplastic large cell lymphoma, ALK-positive, lymph nodes of head, face, and neckBillable
- C84.62Anaplastic large cell lymphoma, ALK-positive, intrathoracic lymph nodesBillable
- C84.63Anaplastic large cell lymphoma, ALK-positive, intra-abdominal lymph nodesBillable
- C84.64Anaplastic large cell lymphoma, ALK-positive, lymph nodes of axilla and upper limbBillable
- C84.65Anaplastic large cell lymphoma, ALK-positive, lymph nodes of inguinal region and lower limbBillable
- C84.66Anaplastic large cell lymphoma, ALK-positive, intrapelvic lymph nodesBillable
- C84.67Anaplastic large cell lymphoma, ALK-positive, spleenBillable
- C84.68Anaplastic large cell lymphoma, ALK-positive, lymph nodes of multiple sitesBillable
- C84.69Anaplastic large cell lymphoma, ALK-positive, extranodal and solid organ sitesBillable
- C84.6AAnaplastic large cell lymphoma, ALK-positive, in remissionBillable
- C84.7Anaplastic large cell lymphoma, ALK-negative
- C84.70Anaplastic large cell lymphoma, ALK-negative, unspecified siteBillable
- C84.71Anaplastic large cell lymphoma, ALK-negative, lymph nodes of head, face, and neckBillable
- C84.72Anaplastic large cell lymphoma, ALK-negative, intrathoracic lymph nodesBillable
- C84.73Anaplastic large cell lymphoma, ALK-negative, intra-abdominal lymph nodesBillable
- C84.74Anaplastic large cell lymphoma, ALK-negative, lymph nodes of axilla and upper limbBillable
- C84.75Anaplastic large cell lymphoma, ALK-negative, lymph nodes of inguinal region and lower limbBillable
- C84.76Anaplastic large cell lymphoma, ALK-negative, intrapelvic lymph nodesBillable
- C84.77Anaplastic large cell lymphoma, ALK-negative, spleenBillable
- C84.78Anaplastic large cell lymphoma, ALK-negative, lymph nodes of multiple sitesBillable
- C84.79Anaplastic large cell lymphoma, ALK-negative, extranodal and solid organ sitesBillable
- C84.7AAnaplastic large cell lymphoma, ALK-negative, breastBillable
- C84.7BAnaplastic large cell lymphoma, ALK-negative, in remissionBillable
- C84.9Mature T/NK-cell lymphomas, unspecified
- 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
- C84.ACutaneous T-cell lymphoma, unspecified
- C84.A0Cutaneous T-cell lymphoma, unspecified, unspecified siteBillable
- C84.A1Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neckBillable
- C84.A2Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodesBillable
- C84.A3Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodesBillable
- C84.A4Cutaneous T-cell lymphoma, unspecified, lymph nodes of axilla and upper limbBillable
- C84.A5Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limbBillable
- C84.A6Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodesBillable
- C84.A7Cutaneous T-cell lymphoma, unspecified, spleenBillable
- C84.A8Cutaneous T-cell lymphoma, unspecified, lymph nodes of multiple sitesBillable
- C84.A9Cutaneous T-cell lymphoma, unspecified, extranodal and solid organ sitesBillable
- C84.AACutaneous T-cell lymphoma, unspecified, in remissionBillable
- C84.ZOther mature T/NK-cell lymphomas
- C84.Z0Other mature T/NK-cell lymphomas, unspecified siteBillable
- C84.Z1Other mature T/NK-cell lymphomas, lymph nodes of head, face, and neckBillable
- C84.Z2Other mature T/NK-cell lymphomas, intrathoracic lymph nodesBillable
- C84.Z3Other mature T/NK-cell lymphomas, intra-abdominal lymph nodesBillable
- C84.Z4Other mature T/NK-cell lymphomas, lymph nodes of axilla and upper limbBillable
- C84.Z5Other mature T/NK-cell lymphomas, lymph nodes of inguinal region and lower limbBillable
- C84.Z6Other mature T/NK-cell lymphomas, intrapelvic lymph nodesBillable
- C84.Z7Other mature T/NK-cell lymphomas, spleenBillable
- C84.Z8Other mature T/NK-cell lymphomas, lymph nodes of multiple sitesBillable
- C84.Z9Other mature T/NK-cell lymphomas, extranodal and solid organ sitesBillable
- C84.ZAOther mature T/NK-cell lymphomas, in remissionBillable
Coding notes
Excludes1Not coded here — never report together with this code
- personal history of non-Hodgkin lymphoma (Z85.72)
Notes that apply from higher levels
Instructions written at a parent level also apply to C84.
Broader instructions also apply from C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue and Chapter 2: Neoplasms.
Codes whose notes reference C84
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about C84
Is C84 billable?
- No. C84 is a header code. Report one of its more specific subcodes instead.