Schema Discriminator 1: Nasopharynx/PharyngealTonsil
This input is used for staging
Description
Nasopharynx and pharyngeal tonsil have the same ICD-O topography code (C111). However, for purposes of stage grouping AJCC 8th edition, nasopharynx and pharyngeal tonsil are staged in different chapters. A schema discriminator is necessary to distinguish between these primary sites so that the appropriate chapter/schema is used.Notes
**Note:** **Schema discriminator for C111** * A schema discriminator is used to discriminate for primary site C111: Posterior wall of nasopharynx. Code the specific site in which the tumor arose. * **00090: Nasopharynx (see code 1)** Used to stage for the following primary site description: posterior wall of nasopharynx (NOS) * **00100 (HPV-Mediated (p16+)) or 00111 (Oropharyngeal Cancer or Oropharynx (p16-)) (see code 2)** Oropharynx Staging Systems are used for the following primary site descriptions. An additional schema discriminator will be used to distinguish between the AJCC HPV-Mediated (p16+) Oropharyngeal Cancer and Oropharynx (p16-) and Hypopharynx Staging System * Adenoid * Pharyngeal tonsil| Code | Description | Schema ID #/Description |
|---|---|---|
| 1 | Posterior wall of nasopharynx, NOS | 00090: Nasopharynx |
| 2 | Adenoid Pharyngeal tonsil |
3927: Schema discriminator 2: Oropharyngeal p16 |
| <BLANK> | Primary Site is NOT C111, Discriminator is not necessary |