2020 ICD-10-CM Diagnosis Code C84.0

Mycosis fungoides

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • C84.0 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM C84.0 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of C84.0 - other international versions of ICD-10 C84.0 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as C84.0. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • peripheral T-cell lymphoma, not classified (
    ICD-10-CM Diagnosis Code C84.4

    Peripheral T-cell lymphoma, not classified

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Lennert's lymphoma
    • Lymphoepithelioid lymphoma
    • Mature T-cell lymphoma, not elsewhere classified
    C84.4-
    )
The following code(s) above C84.0 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C84.0:
  • C00-D49
    2020 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • Functional activity
    • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
    • Morphology [Histology]
    • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
    • Primary malignant neoplasms overlapping site boundaries
    • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
    • Malignant neoplasm of ectopic tissue
    • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
    Neoplasms
  • C81-C96
    2020 ICD-10-CM Range C81-C96

    Malignant neoplasms of lymphoid, hematopoietic and related tissue

    Type 2 Excludes
    • Kaposi's sarcoma of lymph nodes (C46.3)
    • secondary and unspecified neoplasm of lymph nodes (C77.-)
    • secondary neoplasm of bone marrow (C79.52)
    • secondary neoplasm of spleen (C78.89)
    Malignant neoplasms of lymphoid, hematopoietic and related tissue
  • C84
    ICD-10-CM Diagnosis Code C84

    Mature T/NK-cell lymphomas

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • personal history of non-Hodgkin lymphoma (Z85.72)
    Mature T/NK-cell lymphomas
Clinical Information
  • A chronic, malignant t-cell lymphoma of the skin. In the late stages, the lymph nodes and viscera are affected.
  • A kind of skin cancer
  • A peripheral (mature) t-cell lymphoma presenting in the skin with patches/plaques. It is characterized by epidermal and dermal infiltration of small to medium-sized t-cells with cerebriform nuclei. Patients with limited disease generally have an excellent prognosis. In the more advanced stages, the prognosis is poor. (who, 2001)
  • A type of non-hodgkin's lymphoma that first appears on the skin and can spread to the lymph nodes or other organs such as the spleen, liver, or lungs.
  • Chronic malignant t-cell lymphoma of the skin; in the late stages the lymph nodes and viscera are affected.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to C84.0:
  • Mycosis, mycotic B49
    ICD-10-CM Diagnosis Code B49

    Unspecified mycosis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Fungemia NOS
    • fungoides C84.0- (extranodal) (solid organ)

ICD-10-CM Codes Adjacent To C84.0
C83.91 …… lymph nodes of head, face, and neck
C83.92 …… intrathoracic lymph nodes
C83.93 …… intra-abdominal lymph nodes
C83.94 …… lymph nodes of axilla and upper limb
C83.95 …… lymph nodes of inguinal region and lower limb
C83.96 …… intrapelvic lymph nodes
C83.97 …… spleen
C83.98 …… lymph nodes of multiple sites
C83.99 …… extranodal and solid organ sites
C84 Mature T/NK-cell lymphomas
C84.0 Mycosis fungoides
C84.00 …… unspecified site
C84.01 …… lymph nodes of head, face, and neck
C84.02 …… intrathoracic lymph nodes
C84.03 …… intra-abdominal lymph nodes
C84.04 …… lymph nodes of axilla and upper limb
C84.05 …… lymph nodes of inguinal region and lower limb
C84.06 …… intrapelvic lymph nodes
C84.07 …… spleen
C84.08 …… lymph nodes of multiple sites
C84.09 …… extranodal and solid organ sites

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.