Schema Discriminator 1: Thyroid Gland/Thyroglossal Duct
This input is used for staging
Description
Thyroid, NOS and thyroglossal duct have the same ICD-O topography code (C739) However, for purposes of the AJCC Staging Systems Thyroid and Thyroid Medullary stage groupings, Thyroid, NOS is applicable for AJCC staging while thyroglossal duct is not (Summary Stage only). A schema discriminator is necessary to distinguish between these primary sites so that the appropriate system/schema is used.Notes
**Note:** **Schema Discriminator for C739** * A schema discriminator is used to discriminate between thyroid gland and thyroglossal duct tumors with primary site code C739: Thyroid Gland. Code the site in which the tumor arose. * **Thyroid gland (see code 1)** Subsites include Thyroid, NOS * **Thyroglossal duct (see code 2)**| Code | Description |
|---|---|
| 1 | Thyroid gland Thyroid, NOS |
| 2 | Thyroglossal duct cyst |