Schema Discriminator 1: Histology Discriminator for 9591/3
This input is used for staging
Description
There are multiple hematopoietic terms that have the same ICD-O histology code (9591/3). However, for purposes of stage grouping AJCC 8th edition, they are in different chapters. A schema discriminator is necessary to distinguish between these histology terms so that the appropriate sub(chapter)/schema is used.Rationale
A schema discriminator is used to assign AJCC ID when site and histology alone are insufficient to identify the applicable AJCC staging method and to assign Schema ID, which links each case to the appropriate SSDIs, Grade, Summary Stage and EOD data collection system.Additional Info
**Source documents:** pathology reportNotes
**Note:** **Schema Discriminator for 9591/3** * A schema discriminator is used to discriminate for histology 9591/3: Non-Hodgkin lymphoma to determine which Stage Group table to use.Coding Guidelines
**1)** **Code 1**: Splenic B-cell lymphoma/leukemia, unclassifiable * **a.** Abstracted and staged as a **leukemia** **2)** **Code 2**: Hairy cell leukemia variant * **a.** Abstracted and staged as a **leukemia** **3)** **Code 3**: Splenic diffuse red pulp small B-cell lymphoma * **a.** Abstracted and staged as a **lymphoma** **4)** **Code 4**: Non-Hodgkin lymphoma, NOS * **a.** Abstracted and staged as a **lymphoma**NAACCR Item
NAACCR #3926Metadata
SSDI| Code | Description | Schema ID #/Description |
|---|---|---|
| 1 | Splenic B-cell lymphoma/leukemia, unclassifiable | 00830: HemeRetic |
| 2 | Hairy cell leukemia variant Prolymphocytic variant of hairy cell leukemia | 00830: HemeRetic |
| 3 | Splenic diffuse red pulp small B-cell lymphoma Splenic marginal zone lymphoma, diffuse variant Splenic red pulp lymphoma with numerous basophilic villous lymphocytes Splenic lymphoma with villous lymphocytes | 00790: Lymphoma (excluding CLL/SLL) |
| 9 | Non-Hodgkin lymphoma, NOS Any other terminology describing non-Hodgkin lymphoma, NOS | 00790: Lymphoma (excluding CLL/SLL) |
| <BLANK> | Histology is NOT 9591, Discriminator is not necessary |