ICD-10 Diagnosis Code C16.9

Malignant neoplasm of stomach, unspecified

Diagnosis Code C16.9

ICD-10: C16.9
Short Description: Malignant neoplasm of stomach, unspecified
Long Description: Malignant neoplasm of stomach, unspecified
This is the 2019 version of the ICD-10-CM diagnosis code C16.9

Valid for Submission
The code C16.9 is valid for submission for HIPAA-covered transactions.

Deleted Code Additional informationCallout TooltipDeleted Code
The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2018. This code was replaced for the FY 2019 (October 1, 2018-September 30, 2019).

This code was deleted in the 2019 ICD-10 code set with the code(s) listed below.
  • C49.A2 - Gastrointestinal stromal tumor of stomach

Code Classification
  • Neoplasms (C00–D48)
    • Malignant neoplasms of digestive organs (C15-C26)
      • Malignant neoplasm of stomach (C16)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code C16.9 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • 151.9 - Malig neopl stomach NOS

  • Adenocarcinoma of stomach
  • Carcinoma of stomach
  • Diffusely infiltrative tumor configuration
  • Early gastric cancer
  • Epstein-Barr virus associated gastric carcinoma
  • Gastroduodenal disorder
  • Hereditary diffuse carcinoma of stomach
  • Late gastric cancer
  • Leiomyosarcoma of stomach
  • Linitis plastica of stomach
  • Local recurrence of malignant tumor of stomach
  • Malignant tumor of esophagus, stomach and duodenum
  • Malignant tumor of stomach
  • Metastasis from malignant tumor of stomach
  • pN1: Metastasis in 1 to 6 regional
  • pN2: Metastasis in 7 to 15 regional
  • pN3: Metastasis in more than 15 regional
  • Primary malignant mesenchymal neoplasm of stomach
  • Primary malignant neoplasm of stomach
  • pT1: Tumor invades lamina propria or submucosa
  • pT1a: Tumor invades lamina propria
  • pT1b: Tumor invades submucosa
  • pT2: Tumor invades muscularis propria or subserosa
  • pT2a: Tumor invades muscularis propria
  • pT2b: Tumor invades subserosa
  • pT3: Tumor penetrates serosa
  • pT4: Tumor invades adjacent structures
  • T1a: Esophagus/stomach tumor invades lamina propria
  • T1b: Esophagus/stomach tumor invades submucosa
  • T2: Stomach tumor invades muscularis propria or subserosa
  • T2a: Stomach tumor invades muscularis propria
  • T2b: Stomach tumor invades subserosa
  • T3: Stomach tumor penetrates serosa without invasion of adjacent structures

Index of Diseases and Injuries
References found for the code C16.9 in the Index of Diseases and Injuries:

Table of Neoplasms

The code C16.9 is included in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.

Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.

The Tabular must be reviewed for the complete diagnosis code.

Neoplasm, neoplastic Malignant
CaInSitu Benign Uncertain
  »wall NEC

Information for Patients

Stomach Cancer

Also called: Gastric cancer

The stomach is an organ between the esophagus and the small intestine. It mixes food with stomach acid and helps digest protein. Stomach cancer mostly affects older people - two-thirds of people who have it are over age 65. Your risk of getting it is also higher if you

  • Have had a Helicobacter pylori infection
  • Have had stomach inflammation
  • Are a man
  • Eat lots of salted, smoked, or pickled foods
  • Smoke cigarettes
  • Have a family history of stomach cancer

It is hard to diagnose stomach cancer in its early stages. Indigestion and stomach discomfort can be symptoms of early cancer, but other problems can cause the same symptoms. In advanced cases, there may be blood in your stool, vomiting, unexplained weight loss, jaundice, or trouble swallowing. Doctors diagnose stomach cancer with a physical exam, blood and imaging tests, an endoscopy, and a biopsy.

Because it is often found late, it can be hard to treat stomach cancer. Treatment options include surgery, chemotherapy, radiation or a combination.

NIH: National Cancer Institute

  • Abdominal radiation - discharge (Medical Encyclopedia)
  • After chemotherapy - discharge (Medical Encyclopedia)
  • Gastrectomy (Medical Encyclopedia)
  • Radiation enteritis (Medical Encyclopedia)
  • Stomach cancer (Medical Encyclopedia)
  • Understanding Chemotherapy - NIH - Easy-to-Read (National Cancer Institute)
  • What to Know about External Beam Radiation Therapy - NIH - Easy-to-Read (National Cancer Institute)

[Read More]
Previous Code
Next Code