This neoplasm is not reportable.


Indolent T-cell lymphoproliferative disorder of the gastrointestinal tract

ICD-O-3 Morphology

9702/1: Indolent T-cell lymphoproliferative disorder of gastrointestinal tract
Effective 2021 and later


This neoplasm is not reportable

Primary Site(s)

No primary site specified
This neoplasm is reportable for primary sites C700-C729, C751-C753 only.

Abstractor Notes

Most patients present with disease affecting the small bowel or colon. All sites in the gastrointestinal tract can be involved though, including the oral cavity and esophagus. The bone marrow and peripheral blood are usually not involved.

The clinical course is chronic, but progression to disseminated disease has been reported, but is infrequent.


Indolent T-cell lymphoproliferative disorder of the gastrointestinal tract is a clonal T-cell lymphoproliferative disorder that can involve the mucosa in all sites of the gastrointestinal tract, but is most common in the small intestine and colon. The lymphoid cells infiltrate the lamina propria but usually do not show invasion of the epithelium. The clinical course is indolent, but most patients do not respond to conventional chemotherapy. A subset of cases progress to a higher-grade T-cell lymphoma with spread beyond the gastrointestinal tract.

Genetics Data

This data item does not apply


This data item does not apply

Corresponding ICD-9 Codes

238.79 Other lymphatic and hematopoietic tissues

Corresponding ICD-10 Codes

D47.7 Other specified neoplasms of uncertain or unknown behavior of lymphoid, hematopoietic, and related tissue

Corresponding ICD-10-CM Codes (U.S. only)

D47.Z9 Other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue (effective October 01, 2015)

Signs and Symptoms

Abdominal pain
Weight loss


Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, Thiele J (Eds):
WHO Classification of Tumours of Haematopoietic and Lymphoid Tissues (Revised 4th edition)
IARC: Lyon 2017
Section: Mature T- and NK-cell neoplasms
Pages: 379-380

International Classification of Diseases for Oncology, Third Edition, Second Revision. Geneva: World Health Organization, 2020
Section: ICD-O-3.2 (2020) Morphological Codes