2019 ICD-10-CM Diagnosis Code C16.9

Malignant neoplasm of stomach, unspecified

    2016 2017 2018 2019 Billable/Specific Code
  • C16.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM C16.9 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of C16.9 - other international versions of ICD-10 C16.9 may differ.
Applicable To
  • Gastric cancer NOS
The following code(s) above C16.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C16.9:
  • C00-D49
    2019 ICD-10-CM Range C00-D49


    • Functional activity
    • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
    • Morphology [Histology]
    • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
    • Primary malignant neoplasms overlapping site boundaries
    • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
    • Malignant neoplasm of ectopic tissue
    • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
  • C15-C26
    2019 ICD-10-CM Range C15-C26

    Malignant neoplasms of digestive organs

    Type 1 Excludes
    • Kaposi's sarcoma of gastrointestinal sites (C46.4)
    Type 2 Excludes
    • gastrointestinal stromal tumors (C49.A-)
    Malignant neoplasms of digestive organs
  • C16
    ICD-10-CM Diagnosis Code C16

    Malignant neoplasm of stomach

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • malignant carcinoid tumor of the stomach (C7A.092)
    Use Additional
    • code to identify:
    • alcohol abuse and dependence (F10.-)
    Malignant neoplasm of stomach
Approximate Synonyms
  • Adenocarcinoma of stomach
  • Cancer of the stomach
  • Cancer of the stomach, adenocarcinoma
  • Primary malignant neoplasm of stomach
Clinical Information
  • A primary or metastatic malignant neoplasm involving the stomach.
ICD-10-CM C16.9 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 374 Digestive malignancy with mcc
  • 375 Digestive malignancy with cc
  • 376 Digestive malignancy without cc/mcc

Convert C16.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change

Diagnosis Index entries containing back-references to C16.9:
  • Adenocarcinoma - see also Neoplasm, malignant, by site
  • Carcinoma (malignant) - see also Neoplasm, by site, malignant
  • Leather bottle stomach C16.9
  • Tumor - see also Neoplasm, unspecified behavior, by site
    • stromal
      • gastric D48.1
        ICD-10-CM Diagnosis Code D48.1

        Neoplasm of uncertain behavior of connective and other soft tissue

          2016 2017 2018 2019 Billable/Specific Code
        Applicable To
        • Neoplasm of uncertain behavior of connective tissue of ear
        • Neoplasm of uncertain behavior of connective tissue of eyelid
        • Stromal tumors of uncertain behavior of digestive system
        Type 1 Excludes
        • neoplasm of uncertain behavior of articular cartilage (D48.0)
        • neoplasm of uncertain behavior of cartilage of larynx (D38.0)
        • neoplasm of uncertain behavior of cartilage of nose (D38.5)
        • neoplasm of uncertain behavior of connective tissue of breast (D48.6-)
        • malignant C16.9

ICD-10-CM Codes Adjacent To C16.9
C15.9 Malignant neoplasm of esophagus, unspecified
C16 Malignant neoplasm of stomach
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 Malignant neoplasm of small intestine
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 Malignant neoplasm of colon
C18.0 Malignant neoplasm of cecum
C18.1 Malignant neoplasm of appendix

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.