Colon, Rectosigmoid, and Rectum Equivalent Terms and Definitions
C180-C189, C199, C209
(Excludes lymphoma and leukemia M9590 – M9992 and Kaposi sarcoma M9140)
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Table 1: Specific Histologies, NOS, and Subtypes/Variants
Use Table 1 as directed by the Histology Rules to assign the more common histology codes for malignancies found in the colon,
rectosigmoid and rectum.
Note 1: Rare histologies may not be listed in the table. When a histology term is not found, reference ICD-O and all updates.
Note 2: Submit a question to Ask a SEER Registrar when the histology code is not found in Table 1, ICD-O or all updates.
Note 3: Behavior codes are listed when the term has only one possible behavior (either a /2 or /3). For histologies which may be
either /2 or /3, a behavior code is not listed. Code behavior from pathology.
Column 1 contains specific and NOS histology terms.
• Specific histology terms do not have subtypes/variants
• NOS histology terms do have subtypes/variants
Column 2 contains synonyms for the specific or NOS term. Synonyms have the same histology code as the specific or NOS term.
Column 3 contains subtypes/variants of the NOS histology. Subtypes/variants do not have the same histology code as the NOS
term.
Specific and NOS Term and Code
Synonyms for Specific or NOS Term
Subtypes/Variants
Note 1: See Histology Rules
for
instructions on coding
adenocarcinoma
subtypes/variants arising in a
polyp
Note 2: When the term intestinal
adenocarcinoma is used to
describe a colon primary, it
simply means the appearance is
Adenocarcinoma/carcinoma in a polyp
NOS
(now coded to 8140)
Adenocarcinoma/carcinoma in adenomatous
polyp (now coded to 8140)
Adenocarcinoma/carcinoma in polypoid
adenoma (now coded to 8140)
Adenocarcinoma/carcinoma in serrated
adenoma (now coded to 8140)
Adenocarcinoma and mucinous carcinoma,
mucinous documented as less than 50% of
tumor OR percentage of mucinous
Adenoid cystic carcinoma 8200
Cribriform comedo-type carcinoma/
adenocarcinoma, cribriform comedo-type
8201*
Diffuse adenocarcinoma/carcinoma 8145
High grade appendiceal mucinous neoplasm
(HAMN)/Low grade appendiceal mucinous
neoplasm 8480- see Note 3
Linitis plastica 8142/3Medullary
adenocarcinoma/carcinoma 8510
Micropapillary carcinoma 8265*
Mucinous/colloid adenocarcinoma/carcinoma
Colon Solid Tumor Rules
September 2021 Update