Chapter 2

C00–D49: Neoplasms

Neoplasms diagnostic classification updated for 2026.

All CodesBillable 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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