Chapter 2

C00–D49: Neoplasms

Neoplasms diagnostic classification updated for 2026.

All Codes Billable Only

Internal Codes

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C11.0|
Malignant neoplasm of superior wall of nasopharynx
C11.1|
Malignant neoplasm of posterior wall of nasopharynx
C11.2|
Malignant neoplasm of lateral wall of nasopharynx
C11.3|
Malignant neoplasm of anterior wall of nasopharynx
C11.8|
Malignant neoplasm of overlapping sites of nasopharynx
C11.9|
Malignant neoplasm of nasopharynx, unspecified
C12|
Malignant neoplasm of pyriform sinus
C13.0|
Malignant neoplasm of postcricoid region
C13.1|
Malignant neoplasm of aryepiglottic fold, hypopharyngeal aspect
C13.2|
Malignant neoplasm of posterior wall of hypopharynx
C13.8|
Malignant neoplasm of overlapping sites of hypopharynx
C13.9|
Malignant neoplasm of hypopharynx, unspecified
C14.0|
Malignant neoplasm of pharynx, unspecified
C14.2|
Malignant neoplasm of Waldeyer's ring
C14.8|
Malignant neoplasm of overlapping sites of lip, oral cavity and pharynx
C15.3|
Malignant neoplasm of upper third of esophagus
C15.4|
Malignant neoplasm of middle third of esophagus
C15.5|
Malignant neoplasm of lower third of esophagus
C15.8|
Malignant neoplasm of overlapping sites of esophagus
C15.9|
Malignant neoplasm of esophagus, unspecified
C16.0|
Malignant neoplasm of cardia
C16.1|
Malignant neoplasm of fundus of stomach
C16.2|
Malignant neoplasm of body of stomach
C16.3|
Malignant neoplasm of pyloric antrum
C16.4|
Malignant neoplasm of pylorus
C16.5|
Malignant neoplasm of lesser curvature of stomach, unspecified
C16.6|
Malignant neoplasm of greater curvature of stomach, unspecified
C16.8|
Malignant neoplasm of overlapping sites of stomach
C16.9|
Malignant neoplasm of stomach, unspecified
C17.0|
Malignant neoplasm of duodenum
C17.1|
Malignant neoplasm of jejunum
C17.2|
Malignant neoplasm of ileum
C17.3|
Meckel's diverticulum, malignant
C17.8|
Malignant neoplasm of overlapping sites of small intestine
C17.9|
Malignant neoplasm of small intestine, unspecified
C18.0|
Malignant neoplasm of cecum
C18.1|
Malignant neoplasm of appendix
C18.2|
Malignant neoplasm of ascending colon
C18.3|
Malignant neoplasm of hepatic flexure
C18.4|
Malignant neoplasm of transverse colon
C18.5|
Malignant neoplasm of splenic flexure
C18.6|
Malignant neoplasm of descending colon
C18.7|
Malignant neoplasm of sigmoid colon
C18.8|
Malignant neoplasm of overlapping sites of colon
C18.9|
Malignant neoplasm of colon, unspecified
C19|
Malignant neoplasm of rectosigmoid junction
C20|
Malignant neoplasm of rectum
C21.0|
Malignant neoplasm of anus, unspecified
C21.1|
Malignant neoplasm of anal canal
C21.2|
Malignant neoplasm of cloacogenic zone

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