Schema Discriminator 2: Histology Discriminator for 8020/3
This input is used for staging
Description
Histology code 8020/3 is defined as “undifferentiated carcinoma.” In the AJCC 8th chapter for Esophagus, this histology code is further subdivided into squamous or glandular component, which are staged differently. A schema discriminator is necessary to distinguish between these histologies so that the appropriate stage group table is used.Notes
**Note:** **Schema discriminator for 8020/3** * A schema discriminator is used to discriminate for histology 8020/3: Undifferentiated carcinoma to determine which AJCC Stage Group table to use. * **8020/3: Undifferentiated carcinoma with squamous component (see code 1)** Use the Squamous Cell Carcinoma AJCC Stage Group Table * **8020/3: Undifferentiated carcinoma with glandular component (see code 2)** Use the Adenocarcinoma AJCC Stage Group Table * **8020/3: Undifferentiated carcinoma, NOS (no mention of squamous or glandular component) (see code 3)** Use the Squamous Cell Carcinoma AJCC Stage Group Table| Code | Description | Schema ID #/Description |
|---|---|---|
| 1 | Undifferentiated carcinoma with squamous component | 00161: Esophagus (including GE junction) Squamous |
| 2 | Undifferentiated carcinoma with glandular component | 00169: Esophagus (including GE junction) (excluding Squamous) |
| 9 | Undifferentiated carcinoma, NOS | 00161: Esophagus (including GE junction) Squamous |
| <BLANK> | Histology is NOT 8020, Discriminator is not necessary |