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SEER Inquiry System - Report
Produced: 10/14/2025 7:01 AM
Question 20230038
Inquiry Details
References:
Heme & Lymph Manual & DB
Question:
Histology/Heme & Lymphoid Neoplasms--Mycosis Fungoides: What is the histology code for lymphomatoid papulosis that transforms initially to mycosis fungoides (MF)/cutaneous T-cell lymphoma (CTCL) and subsequently to CTCL with large cell transformation, and is it a new primary? See Discussion.
Discussion:
Disease History
2018 - Lymphomatoid papulosis (non-reportable)
2020 - Transform to CTCL (and called Mycosis Fungoides specifically) (CTCL/MF same primary)
2021 - Transform to CTCL with large cell transformation
Answer:
Abstract a single primary and assign code 9700/3 for MF. According to our subject matter expert, this is all MF. When MF progresses, there can be large cd30 positive T cells. This is not the same as anaplastic large cell lymphoma.
