ICD-10 Diagnosis Code K31.6

Fistula of stomach and duodenum

Diagnosis Code K31.6

ICD-10: K31.6
Short Description: Fistula of stomach and duodenum
Long Description: Fistula of stomach and duodenum
This is the 2018 version of the ICD-10-CM diagnosis code K31.6

Valid for Submission
The code K31.6 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the digestive system (K00–K93)
    • Diseases of esophagus, stomach and duodenum (K20-K31)
      • Other diseases of stomach and duodenum (K31)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code K31.6 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.
  • 537.4 - Gastric/duodenal fistula

  • Aortic fistula
  • Aortointestinal fistula
  • Arterial-enteric fistula
  • Duodenal fistula
  • Duodenal stump fistula
  • Duodenoaortic fistula
  • Duodenocolic fistula
  • Duodenoenteric fistula
  • Duodenorenal fistula
  • Enterocutaneous fistula
  • Esophagoenteric fistula
  • External duodenal fistula
  • External gastric fistula
  • External gastrointestinal fistula
  • External small bowel fistula
  • Gastric fistula
  • Gastrocolic fistula
  • Gastroduodenal disorder
  • Gastroduodenal fistula
  • Gastrointestinal fistula
  • Gastrojejunal fistula
  • Gastrojejunocolic fistula
  • High-output external gastrointestinal fistula
  • Internal duodenal fistula
  • Internal gastric fistula
  • Internal gastrointestinal fistula
  • Internal small bowel fistula
  • Jejunal fistula
  • Low-output external gastrointestinal fistula

Index of Diseases and Injuries
References found for the code K31.6 in the Index of Diseases and Injuries:

Information for Patients


A fistula is an abnormal connection between two parts inside of the body. Fistulas may develop between different organs, such as between the esophagus and the windpipe or the bowel and the vagina. They can also develop between two blood vessels, such as between an artery and a vein or between two arteries.

Some people are born with a fistula. Other common causes of fistulas include

  • Complications from surgery
  • Injury
  • Infection
  • Diseases, such as Crohn's disease or ulcerative colitis

Treatment depends on the cause of the fistula, where it is, and how bad it is. Some fistulas will close on their own. In some cases, you may need antibiotics and/or surgery.

  • Fistula (Medical Encyclopedia)
  • Gastrointestinal fistula (Medical Encyclopedia)

[Read More]

Small Intestine Disorders

Your small intestine is the longest part of your digestive system - about twenty feet long! It connects your stomach to your large intestine (or colon) and folds many times to fit inside your abdomen. Your small intestine does most of the digesting of the foods you eat. It has three areas called the duodenum, the ileum, and the jejunum.

Problems with the small intestine can include:

  • Bleeding
  • Celiac disease
  • Crohn's disease
  • Infections
  • Intestinal cancer
  • Intestinal obstruction
  • Irritable bowel syndrome
  • Ulcers, such as peptic ulcer

Treatment of disorders of the small intestine depends on the cause.

  • Duodenal atresia (Medical Encyclopedia)
  • EGD - esophagogastroduodenoscopy (Medical Encyclopedia)
  • EGD discharge (Medical Encyclopedia)
  • Enteritis (Medical Encyclopedia)
  • Enteroscopy (Medical Encyclopedia)
  • Meckel's diverticulectomy (Medical Encyclopedia)
  • Small bowel bacterial overgrowth (Medical Encyclopedia)
  • Small bowel resection (Medical Encyclopedia)
  • Upper GI and small bowel series (Medical Encyclopedia)

[Read More]

Stomach Disorders

Also called: Gastric disorders

Your stomach is an organ between your esophagus and small intestine. It is where digestion of protein begins. The stomach has three tasks. It stores swallowed food. It mixes the food with stomach acids. Then it sends the mixture on to the small intestine.

Most people have a problem with their stomach at one time or another. Indigestion and heartburn are common problems. You can relieve some stomach problems with over-the-counter medicines and lifestyle changes, such as avoiding fatty foods or eating more slowly. Other problems like peptic ulcers or GERD require medical attention.

You should see a doctor if you have any of the following:

  • Blood when you have a bowel movement
  • Severe abdominal pain
  • Heartburn not relieved by antacids
  • Unintended weight loss
  • Ongoing vomiting or diarrhea

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

  • Bezoar (Medical Encyclopedia)
  • Dumping Syndrome - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)
  • EGD discharge (Medical Encyclopedia)
  • Gastrectomy (Medical Encyclopedia)
  • Gastritis (Medical Encyclopedia)
  • Gastroparesis (Medical Encyclopedia)
  • Pyloric stenosis (Medical Encyclopedia)
  • Stomach acid test (Medical Encyclopedia)
  • Upper GI and small bowel series (Medical Encyclopedia)

[Read More]
Previous Code
Previous Code K31.5
Next Code
K31.7 Next Code