C84.0 – Mycosis fungoides
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lymphoid, hematopoietic and related tissue
- Code
C84.0(claims format:C840)- Description
- Mycosis fungoides
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue
- Parent codes
- C84
Billable codes under C84.0
C84.0 is a header code and cannot be used on claims. Choose the most specific code:
- C84.00 – Mycosis fungoides, unspecified siteBillable
- C84.01 – Mycosis fungoides, lymph nodes of head, face, and neckBillable
- C84.02 – Mycosis fungoides, intrathoracic lymph nodesBillable
- C84.03 – Mycosis fungoides, intra-abdominal lymph nodesBillable
- C84.04 – Mycosis fungoides, lymph nodes of axilla and upper limbBillable
- C84.05 – Mycosis fungoides, lymph nodes of inguinal region and lower limbBillable
- C84.06 – Mycosis fungoides, intrapelvic lymph nodesBillable
- C84.07 – Mycosis fungoides, spleenBillable
- C84.08 – Mycosis fungoides, lymph nodes of multiple sitesBillable
- C84.09 – Mycosis fungoides, extranodal and solid organ sitesBillable
- C84.0A – Mycosis fungoides, in remissionBillable
Notes for C84.0
- peripheral T-cell lymphoma, not elsewhere classified (C84.4-)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C84 – Mature T/NK-cell lymphomas
- personal history of non-Hodgkin lymphoma (Z85.72)
Block C81-C96
Index terms for C84.0
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in C84
- C84.1 – Sezary diseaseHeader
- C84.4 – Peripheral T-cell lymphoma, not elsewhere classifiedHeader
- C84.6 – Anaplastic large cell lymphoma, ALK-positiveHeader
- C84.7 – Anaplastic large cell lymphoma, ALK-negativeHeader
- C84.A – Cutaneous T-cell lymphoma, unspecifiedHeader
- C84.Z – Other mature T/NK-cell lymphomasHeader
- C84.9 – Mature T/NK-cell lymphomas, unspecifiedHeader
Frequently asked questions
What is ICD-10 code C84.0?
C84.0 is the ICD-10-CM code for mycosis fungoides, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).
Is C84.0 a billable code?
No. C84.0 is a header code with more specific child codes; report one of the billable codes listed above.
What category does C84.0 belong to?
It belongs to category C84 – Mature T/NK-cell lymphomas.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.