Nasopharynx – V9: 2025+

Primary Site Histology Schema Discriminator 1 Year of Diagnosis
C110, C112-C113, C118-C119 8000-8700 <Any value> 2025-9998, 9999, <BLANK>
C111 8000-8700 1 2025-9998, 9999, <BLANK>

Notes

C110, C112-C113, C118-C119: 8000-8700
C111 and Schema Discriminator 1: Nasopharynx/PharyngealTonsil: 1 (8000-8700)

C110 Superior wall of nasopharynx
C111 Posterior wall of nasopharynx (excluding pharyngeal tonsil)
C112 Lateral wall of nasopharynx
C113 Anterior wall of nasopharynx
C118 Overlapping lesion of nasopharynx
C119 Nasopharynx, NOS

Note 1: Sources used in the development of this schema

  • SEER Extent of Disease 1988: Codes and Coding Instructions (3rd Edition, 1998) (https://seer.cancer.gov/archive/manuals/EOD10Dig.3rd.pdf)
  • SEER Summary Staging Manual-2000: Codes and Coding Instructions (https://seer.cancer.gov/tools/ssm/ssm2000/)
  • Collaborative Stage Data Collection System, version 02.05: https://cancerstaging.org/cstage/Pages/default.aspx
  • Nasopharynx, from the AJCC Cancer Staging System Version 9 (2025). Used with permission of the American College of Surgeons, Chicago, Illinois.

Note 2: Other EOD Schemas with Nasopharynx sites

  • GIST: 8935-8936
  • Kaposi Sarcoma: 9140
  • Melanoma Head and Neck: 8720-8790
  • Mycosis Fungoides: 9700-9701
    Oropharynx (p16-) and Oropharynx HPV-Mediated (p16+): C111 and Schema Discriminator 1: Nasopharynx/PharyngealTonsil: 2 (8000-8700):
    Soft Tissue Head and Neck: 8710-8714, 8800-8803, 8810-8905, 8912, 8921, 8932-8934, 8940-8990, 9000-9016, 9030-9043, 9045-9110, 9121-9138, 9141-9230, 9240-9580, 9582
    Soft Tissue Other: 8992
    Soft Tissue Rare: 8804-8806, 8910, 8920, 8930-8931, 8991, 9020, 9044, 9120, 9231, 9581

Note 3: Schema Discriminator

  • The Schema Discriminator Nasopharynx/Pharyngeal Tonsil is used to discriminate between Posterior wall of nasopharynx (adenoid) and Pharyngeal tonsil which are coded to ICD-O-3 code C111

Data Items

Name Default Value Used in Derivation NAACCR Item Required By Metadata
Year of Diagnosis <BLANK> Yes NAACCR #390
dateOfDiagnosis 		None
Primary Site <BLANK> Yes NAACCR #400
primarySite 		None
Histology <BLANK> Yes NAACCR #522
histologicTypeIcdO3 		None
Behavior <BLANK> No NAACCR #523
behaviorCodeIcdO3 		None
Schema Discriminator 1 <BLANK> Yes NAACCR #3926
schemaDiscriminator1 		All SSDI
Tumor Size Clinical <BLANK> No NAACCR #752
tumorSizeClinical 		None
Tumor Size Pathological <BLANK> No NAACCR #754
tumorSizePathologic 		None
Tumor Size Summary 999 No NAACCR #756
tumorSizeSummary 		None
Regional Nodes Positive 99 No NAACCR #820
regionalNodesPositive 		None
Regional Nodes Examined 99 No NAACCR #830
regionalNodesExamined 		None
RX Summ Surgery/Radiation Sequence <BLANK> No NAACCR #1380
rxSummSurgRadSeq 		None
RX Summ Systemic/Surgery Sequence <BLANK> No NAACCR #1639
rxSummSystemicSurSeq 		None
Neoadjuvant Therapy 9 No NAACCR #1632
neoadjuvantTherapy 		None
Neoadjuvant Therapy – Clinical Response 9 No NAACCR #1633
neoadjuvTherapyClinicalResponse 		None
Neoadjuvant Therapy – Treatment Effect 9 No NAACCR #1634
neoadjuvTherapyTreatmentEffect 		None
EOD Primary Tumor 999 Yes NAACCR #772
eodPrimaryTumor 		None
EOD Regional Nodes 999 Yes NAACCR #774
eodRegionalNodes 		None
EOD Mets 00 Yes NAACCR #776
eodMets 		None
SS2018 <BLANK> No NAACCR #764
summaryStage2018 		None
Grade Clinical 9 Yes NAACCR #3843
gradeClinical 		All SSDI
Grade Pathological 9 Yes NAACCR #3844
gradePathological 		All SSDI
Grade Post Therapy Clin (yc) <BLANK> No NAACCR #1068
gradePostTherapyClin 		COC
NPCR
SEER		 SSDI
Grade Post Therapy Path (yp) <BLANK> No NAACCR #3845
gradePostTherapy 		CCCR/Canada
COC
NPCR
SEER		 SSDI
Extranodal Exten H&N Clin 8 No NAACCR #3831
extranodalExtensionHeadNeckClin 		COC
SEER (RC)		 SSDI
Extranodal Exten H&N Path X.8 No NAACCR #3832
extranodalExtensionHeadNeckPath 		CCCR/Canada
COC
SEER		 SSDI
LN Size XX.8 No NAACCR #3883
lnSize 		CCCR/Canada
COC
SEER		 SSDI