The clinical variant of a T-cell lymphoma which may not be able to be distinguished pathologically.
The coding system used is ICD-O (International Classification of Diseases for Oncology) Morphology coding, with an additional letter to make the code unique.

National codes:

M97003A	Mycosis fungoides
M97013A	Sézary syndrome
M97003B	Localised MF variants - pagetoid reticulosis (Woringer Kolopp disease)
M97003C	Other MF variants - follicular mucinosis
M97003D	Other MF variants - granulomatous slack skin
M97183A	CD30+ primary cutaneous lymphoproliferative disorders - lymphomatoid papulosis
M97183B	CD30+ primary cutaneous lymphoproliferative disorders - primary large cell anaplastic lymphoma
M97083A	Subcutaneous panniculitis-like T-cell lymphoma

References:
National Cancer Data Set Version 2.1_ISB October 2002