2026 ICD-10-CM Diagnosis Code C16.0Malignant neoplasm of cardia
ICD-10-CM Codes›C00–D49›C15-C26›C16
- Billable — Valid for Submission
- Chronic Condition
C16.0 is a billable ICD-10-CM diagnosis code for malignant neoplasm of cardia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 374 through 376. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal cancers - stomach.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Carcinoma of cardia
- Leiomyosarcoma of cardia of stomach
- Leiomyosarcoma of cardioesophageal junction
- Leiomyosarcoma of esophagus
- Leiomyosarcoma of stomach
- Lymphoma of cardia of stomach
- Lymphoma of cardioesophageal junction
- Malignant lymphoma of esophagus
- Malignant mesenchymal neoplasm of esophagus
- Malignant neoplasm of cardia of stomach
- Malignant neoplasm of cardiac orifice of stomach
- Malignant neoplasm of cardio-esophageal junction of stomach
- Primary adenocarcinoma of cardia of stomach
- Primary adenocarcinoma of distal third of esophagus
- Primary adenocarcinoma of esophagogastric junction
- Primary carcinoma of cardia
- Primary malignant neoplasm of abdominal esophagus
- Primary malignant neoplasm of cardia of stomach
- Primary malignant neoplasm of esophagogastric junction
- Primary malignant neoplasm of lower third of esophagus
- Siewert type I adenocarcinoma of esophagogastric junction
- Siewert type II adenocarcinoma of esophagogastric junction
- Siewert type III adenocarcinoma of esophagogastric junction
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Malignant neoplasm of cardiac orifice
- Malignant neoplasm of cardio-esophageal junction
- Malignant neoplasm of esophagus and stomach
- Malignant neoplasm of gastro-esophageal junction
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Esophagogastric Junction
the area covering the terminal portion of esophagus and the beginning of stomach at the cardiac orifice.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| cardia (gastric) | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| cardiac orifice (stomach) | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| cardio-esophageal junction | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| cardio-esophagus | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| esophagogastric junction | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| gastroesophageal junction | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| junction › cardioesophageal | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| junction › esophagogastric | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| junction › gastroesophageal | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › cardia | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › cardiac orifice | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
Patient EducationClinical
Stomach 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:
The full article covers:
- What is Stomach Cancer?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C16.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C16.0Overview
Is C16.0 (Malignant neoplasm of stomach) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of cardia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C16.0 group to?
When malignant neoplasm of cardia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 374, 375, 376, with relative weights from 0.9243 to 2.1387 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of C16.0?
Under the General Equivalence Mappings, malignant neoplasm of cardia converts to ICD-9-CM 151.0 (mal neo stomach cardia). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
