C84.0
C84.0 — Mycosis fungoides
Non-billable headerICD-10-CM
C84.0 is a non-billable header ICD-10-CM code for mycosis fungoides. 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.
- peripheral T-cell lymphoma, not elsewhere classified (C84.4-)
Risk adjustment
C84.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead C84.0
11 child codes. Green means billable.
- 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
Related codes at this level
Codes that share C84. If C84.0 is not quite right, the correct code is usually one of these.
Questions about C84.0
- Is C84.0 a billable ICD-10-CM code?
- No. C84.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does C84.0 sit in the tabular list?
- Neoplasms (C00-D49), in the block Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96).
- What cannot be coded together with C84.0?
- C84.0 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.