C84 — Mature T/NK-cell lymphomas
Not billable
Is C84 billable?
No — C84 is a non-billable header code. C84 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 60 billable codes beneath C84.
Billable codes under this header
- C84.00Mycosis fungoides, unspecified site
- C84.01Mycosis fungoides, lymph nodes of head, face, and neck
- C84.02Mycosis fungoides, intrathoracic lymph nodes
- C84.03Mycosis fungoides, intra-abdominal lymph nodes
- C84.04Mycosis fungoides, lymph nodes of axilla and upper limb
- C84.05Mycosis fungoides, lymph nodes of inguinal region and lower limb
- C84.06Mycosis fungoides, intrapelvic lymph nodes
- C84.07Mycosis fungoides, spleen
- C84.08Mycosis fungoides, lymph nodes of multiple sites
- C84.09Mycosis fungoides, extranodal and solid organ sites
- C84.0AMycosis fungoides, in remission
- C84.10Sezary disease, unspecified site
- C84.11Sezary disease, lymph nodes of head, face, and neck
- C84.12Sezary disease, intrathoracic lymph nodes
- C84.13Sezary disease, intra-abdominal lymph nodes
- C84.14Sezary disease, lymph nodes of axilla and upper limb
- C84.15Sezary disease, lymph nodes of inguinal region and lower limb
- C84.16Sezary disease, intrapelvic lymph nodes
- C84.17Sezary disease, spleen
- C84.18Sezary disease, lymph nodes of multiple sites
- C84.19Sezary disease, extranodal and solid organ sites
- C84.1ASezary disease, in remission
- C84.40Peripheral T-cell lymphoma, not elsewhere classified, unspecified site
- C84.41Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neck
- C84.42Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes
- C84.43Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes
- C84.44Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of axilla and upper limb
- C84.45Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of inguinal region and lower limb
- C84.46Peripheral T-cell lymphoma, not elsewhere classified, intrapelvic lymph nodes
- C84.47Peripheral T-cell lymphoma, not elsewhere classified, spleen
- C84.48Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of multiple sites
- C84.49Peripheral T-cell lymphoma, not elsewhere classified, extranodal and solid organ sites
- C84.4APeripheral T-cell lymphoma, not elsewhere classified, in remission
- C84.60Anaplastic large cell lymphoma, ALK-positive, unspecified site
- C84.61Anaplastic large cell lymphoma, ALK-positive, lymph nodes of head, face, and neck
- C84.62Anaplastic large cell lymphoma, ALK-positive, intrathoracic lymph nodes
- C84.63Anaplastic large cell lymphoma, ALK-positive, intra-abdominal lymph nodes
- C84.64Anaplastic large cell lymphoma, ALK-positive, lymph nodes of axilla and upper limb
- C84.65Anaplastic large cell lymphoma, ALK-positive, lymph nodes of inguinal region and lower limb
- C84.66Anaplastic large cell lymphoma, ALK-positive, intrapelvic lymph nodes
- C84.67Anaplastic large cell lymphoma, ALK-positive, spleen
- C84.68Anaplastic large cell lymphoma, ALK-positive, lymph nodes of multiple sites
- C84.69Anaplastic large cell lymphoma, ALK-positive, extranodal and solid organ sites
- C84.6AAnaplastic large cell lymphoma, ALK-positive, in remission
- C84.70Anaplastic large cell lymphoma, ALK-negative, unspecified site
- C84.71Anaplastic large cell lymphoma, ALK-negative, lymph nodes of head, face, and neck
- C84.72Anaplastic large cell lymphoma, ALK-negative, intrathoracic lymph nodes
- C84.73Anaplastic large cell lymphoma, ALK-negative, intra-abdominal lymph nodes
- C84.74Anaplastic large cell lymphoma, ALK-negative, lymph nodes of axilla and upper limb
- C84.75Anaplastic large cell lymphoma, ALK-negative, lymph nodes of inguinal region and lower limb
- C84.76Anaplastic large cell lymphoma, ALK-negative, intrapelvic lymph nodes
- C84.77Anaplastic large cell lymphoma, ALK-negative, spleen
- C84.78Anaplastic large cell lymphoma, ALK-negative, lymph nodes of multiple sites
- C84.79Anaplastic large cell lymphoma, ALK-negative, extranodal and solid organ sites
- C84.7AAnaplastic large cell lymphoma, ALK-negative, breast
- C84.7BAnaplastic large cell lymphoma, ALK-negative, in remission
- C84.A0Cutaneous T-cell lymphoma, unspecified, unspecified site
- C84.A1Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neck
- C84.A2Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes
- C84.A3Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes
C84 at a glance
| Code | C84 |
|---|---|
| Description | Mature T/NK-cell lymphomas |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with C84 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- personal history of non-Hodgkin lymphoma (Z85.72)
Excludes2 — not included here — inherited from C81-C96
The conditions below are not part of C84, but a patient may have both at the same time. When documentation supports it, C84 and the excluded code may both be reported.
What codes fall under C84? (8)
- C84.0Mycosis fungoidesnot billable
- C84.1Sezary diseasenot billable
- C84.4Peripheral T-cell lymphoma, not elsewhere classifiednot billable
- C84.6Anaplastic large cell lymphoma, ALK-positivenot billable
- C84.7Anaplastic large cell lymphoma, ALK-negativenot billable
- C84.ACutaneous T-cell lymphoma, unspecifiednot billable
- C84.ZOther mature T/NK-cell lymphomasnot billable
- C84.9Mature T/NK-cell lymphomas, unspecifiednot billable
How long has C84 existed?
C84 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with C84?
ICD-10-CM declares these codes mutually exclusive with C84 — exactly one of each pair can be correct for a given encounter.