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Organization	Field Name	ID	Required
KCR	EOD Schema Discriminator 1	30122
SEER	Schema Discriminator 1	3926

Note A schema discriminator is used to discriminate for primary site C111 Posterior wall of nasopharynx. Code the specific site in which the tumor arose.

Chapter 9 Nasopharynx (see code 1)
Used to stage for the following primary site descriptions posterior wall of nasopharynx (NOS)
Chapter 10 or 11 HPV-Mediated (p16+) Oropharyngeal Cancer or Oropharynx (p16-) (see code 2)
Oropharynx chapters are used for the following primary site descriptions.

An additional schema discriminator will be used to distinguish between Chapter 10 and 11.

Adenoid
Pharyngeal tonsil

Code	Description	Disease
1	Posterior wall of nasopharynx, NOS	9: Nasopharynx
2	Adenoid Pharyngeal tonsil	Schema discriminator 2: Oropharyngeal p16
<BLANK>	Primary Site is NOT C111, Discriminator is not necessary	<BLANK>