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  5. Other diseases of stomach and duodenum (K31)

Other diseases of stomach and duodenum (K31)

This section, identified by K31 in the ICD-10 coding system, covers a variety of other diseases of the stomach and duodenum not classified elsewhere. These codes are used to document conditions such as acute stomach dilation, strictures, fistulas, polyps, and motility disorders, helping medical professionals accurately classify rare or complex gastrointestinal diagnoses.

The ICD-10 code for acute dilatation of stomach (K31.0) includes cases called Bouchard's disease. Adult hypertrophic pyloric stenosis (K31.1) covers acquired narrowing or obstruction of the pylorus, also known by terms like pyloric obstruction or acquired pyloric stricture. Codes such as K31.4 and K31.5 are assigned for gastric diverticulum and duodenal obstruction, respectively, the latter encompassing various duodenal ulcer complications. The section also includes angiodysplasia with or without bleeding (K31.81 series), a vascular abnormality sometimes resulting in gastrointestinal hemorrhage. Additionally, gastroparesis (K31.84) is coded here, describing delayed stomach emptying or gastric motor dysfunction. For polyps in the stomach and duodenum, K31.7 is used, covering benign growths like fundic gland polyposis and inflammatory fibroid polyps. The section extends to diseases like gastric intestinal metaplasia (K31.A series), from unspecified to those with dysplasia, important in assessing precancerous stomach changes.

  • Diseases of the digestive system (K00–K95)

    • Diseases of esophagus, stomach and duodenum (K20-K31)

        • Other diseases of stomach and duodenum (K31)

        • K31 Other diseases of stomach and duodenum
        • K31.0 Acute dilatation of stomach
        • K31.1 Adult hypertrophic pyloric stenosis
        • K31.2 Hourglass stricture and stenosis of stomach
        • K31.3 Pylorospasm, not elsewhere classified
        • K31.4 Gastric diverticulum
        • K31.5 Obstruction of duodenum
        • K31.6 Fistula of stomach and duodenum
        • K31.7 Polyp of stomach and duodenum
        • K31.8 Other specified diseases of stomach and duodenum
        • K31.81 Angiodysplasia of stomach and duodenum
        • K31.811 Angiodysplasia of stomach and duodenum with bleeding
        • K31.819 Angiodysplasia of stomach and duodenum without bleeding
        • K31.82 Dieulafoy lesion (hemorrhagic) of stomach and duodenum
        • K31.83 Achlorhydria
        • K31.84 Gastroparesis
        • K31.89 Other diseases of stomach and duodenum
        • K31.9 Disease of stomach and duodenum, unspecified
        • K31.A Gastric intestinal metaplasia
        • K31.A0 Gastric intestinal metaplasia, unspecified
        • K31.A1 Gastric intestinal metaplasia without dysplasia
        • K31.A11 Gastric intestinal metaplasia without dysplasia, involving the antrum
        • K31.A12 Gastric intestinal metaplasia without dysplasia, involving the body (corpus)
        • K31.A13 Gastric intestinal metaplasia without dysplasia, involving the fundus
        • K31.A14 Gastric intestinal metaplasia without dysplasia, involving the cardia
        • K31.A15 Gastric intestinal metaplasia without dysplasia, involving multiple sites
        • K31.A19 Gastric intestinal metaplasia without dysplasia, unspecified site
        • K31.A2 Gastric intestinal metaplasia with dysplasia
        • K31.A21 Gastric intestinal metaplasia with low grade dysplasia
        • K31.A22 Gastric intestinal metaplasia with high grade dysplasia
        • K31.A29 Gastric intestinal metaplasia with dysplasia, unspecified

Instructional Notations

Includes

This note appears immediately under a three character code title to further define, or give examples of, the content of the category.

  • functional disorders of stomach

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Achlorhydria

A lack of HYDROCHLORIC ACID in GASTRIC JUICE despite stimulation of gastric secretion.

Gastric Fistula

Abnormal passage communicating with the STOMACH.

Gastroparesis

Chronic delayed gastric emptying. Gastroparesis may be caused by motor dysfunction or paralysis of STOMACH muscles or may be associated with other systemic diseases such as DIABETES MELLITUS.

Hypertrophy

General increase in bulk of a part or organ due to CELL ENLARGEMENT and accumulation of FLUIDS AND SECRETIONS, not due to tumor formation, nor to an increase in the number of cells (HYPERPLASIA).

Intestinal Volvulus

A twisting in the intestine (INTESTINES) that can cause INTESTINAL OBSTRUCTION.

Pyloric Stenosis

Narrowing of the pyloric canal with varied etiology. A common form is due to muscle hypertrophy (PYLORIC STENOSIS, HYPERTROPHIC) seen in infants.

Pyloric Stenosis, Hypertrophic

Narrowing of the pyloric canal due to HYPERTROPHY of the surrounding circular muscle. It is usually seen in infants or young children.

Stomach

An organ of digestion situated in the left upper quadrant of the abdomen between the termination of the ESOPHAGUS and the beginning of the DUODENUM.