Malignant lymphoma, NOS

ICD-O-1 Morphology
9590/3: Malignant lymphoma, NOS
Effective 1978 - 1991
ICD-O-2 Morphology
9590/3: Malignant lymphoma, NOS
Effective 1992 - 2000
ICD-O-3 Morphology
9590/3: Malignant lymphoma, NOS
Effective 2001 and later
for cases diagnosed 1978 and later
Primary Site(s)
See Abstractor Notes and Module 7

Code grade specified by pathologist. If no grade specified, code 9
Module Rule
Alternate Names
Microglioma [OBS]
General term for a group of cancers that originate in the lymphatic system. Unable to determine if Hodgkin or non-Hodgkin type. This is not a commonly used pathology term.
Abstractor Notes
This NOS histology is a generic disease description. DCO cases or path report only cases may stay in this classification. In most cases, an NOS histology is only the working diagnosis; the physician will run further diagnostic procedures and look for various clinical presentations to identify a more specific disease.

Further review of the medical record should be performed to look for the tests listed as definitive diagnosis. When a more specific diagnosis is identified, the histology should be changed to the more specific neoplasm name and code.

For 9590/3 malignant lymphoma, NOS, non-Hodgkin lymphoma, classical Hodgkin lymphoma, and any specific Hodgkin and non-Hodgkin lymphomas would be a more specific histology.

See the histology tables (Appendix B of the Hematopoietic manual) for more information on NOS and more specific histologies.
Definitive Diagnostic Methods
Clinical diagnosis
Histologic confirmation
Genetics Data
Hematologic Transplant and/or Endocrine Procedures
Hormone therapy
Radiation therapy
Transformations to
There are no known transformations
Transformations from
There are no known transformations
Same Primaries
Corresponding ICD-9 Codes
202.8 Other lymphoma
Corresponding ICD-10 Codes
C85.9 Non-Hodgkin's lymphoma, unspecified type
Corresponding ICD-10-CM Codes (U.S. only)
C85.9 Non-Hodgkin's lymphoma, unspecified (effective October 01, 2015)
C83.9 Non-follicular (diffuse) lymphoma, unspecified (effective October 01, 2015)
Signs and Symptoms
Diagnostic Exams
Progression and Transformation
Epidemiology and Mortality