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K31.8 - Other Specified Stomach Diseases | ICD-10
K31.8 is an ICD-10 diagnosis code for other specified diseases of the stomach and duodenum, covering various organic conditions of these digestive organs.
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K31.8 is an ICD-10 diagnosis code for other specified diseases of the stomach and duodenum, covering various organic conditions of these digestive organs.
What Does the Diagnosis Code K31.8 Mean?
The ICD-10 code K31.8 stands for other specified diseases of the stomach and duodenum. It is used when a specific condition of the stomach or duodenum is present that cannot be assigned to any other, more precise code within the K31 category, but is still clinically clearly definable. The K31 category generally encompasses organic diseases of the stomach and duodenum (the first part of the small intestine).
Which Conditions Can Be Classified Under K31.8?
A variety of conditions and states may be coded under this classification, including:
- Gastric polyps: Benign mucosal growths in the stomach, often discovered incidentally during an endoscopy.
- Gastric diverticula: Outpouchings of the stomach wall, which are usually asymptomatic.
- Gastroptosis: Abnormal downward displacement of the stomach within the abdominal cavity.
- Erosive gastropathy: Superficial damage to the gastric mucosa without complete ulceration.
- Functional gastric outlet disorders: Delayed gastric emptying due to mechanical or inflammatory causes.
- Other specific anomalies of the stomach or duodenum that are clinically documented.
Causes and Risk Factors
The causes of the conditions grouped under K31.8 are diverse:
- Helicobacter pylori infection: A frequent trigger for mucosal changes in the stomach.
- Long-term use of non-steroidal anti-inflammatory drugs (NSAIDs): Can damage the gastric lining.
- Reflux of bile or acid: Leads to chronic irritation of the mucosa.
- Autoimmune processes: Can attack the gastric mucosa, as seen in autoimmune gastritis.
- Chronic alcohol or tobacco consumption: Promotes mucosal damage over time.
Symptoms
Many conditions under K31.8 are asymptomatic or cause non-specific complaints:
- Upper abdominal pain or pressure
- Nausea and vomiting
- Early satiety
- Belching or acid sensation
- Weight loss (in more severe cases)
- Blood in stool or vomiting of blood (in rare, serious cases)
Diagnosis
Diagnosis is typically established through:
- Esophagogastroduodenoscopy (EGD): A gastroscopy in which the mucosa of the stomach and duodenum is directly visualised and tissue samples can be taken if necessary.
- Histological examination: Laboratory analysis of tissue samples for precise classification of the condition.
- Imaging procedures: Abdominal ultrasound or CT scan to assess the structure of the stomach.
- Helicobacter pylori testing: Breath test, blood test, or stool test to detect infection.
Treatment
Treatment is guided by the specific condition coded under K31.8:
- Proton pump inhibitors (PPIs): Medications to suppress acid secretion in erosive conditions (e.g., omeprazole, pantoprazole).
- Helicobacter pylori eradication: Combination therapy of antibiotics and PPIs when infection is confirmed.
- Endoscopic resection: Removal of polyps or other mucosal lesions during gastroscopy.
- Medication adjustment: Discontinuation or substitution of stomach-damaging drugs (e.g., NSAIDs).
- Dietary modification: Avoidance of foods and beverages that irritate the gastric mucosa.
- Surgical therapy: In rare cases involving severe structural changes.
Clinical Relevance of Code K31.8
The code K31.8 is relevant in clinical practice because it enables precise documentation of gastric conditions that are clearly diagnosed but do not fall under a more specific ICD-10 code. Correct coding is essential for medical billing, quality assurance, and epidemiological research. Physicians and clinical staff should always document the underlying condition in the medical record when using this code.
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Geneva: WHO, 2019.
- Longo, D.L. et al. (Eds.): Harrison's Principles of Internal Medicine, 21st Edition. McGraw-Hill, New York, 2022 - Chapter on Diseases of the Stomach and Duodenum.
- Koop, H. et al.: S2k-Leitlinie Gastritis und Helicobacter pylori. AWMF-Register Nr. 021-001, Deutsche Gesellschaft für Gastroenterologie, Verdauungs- und Stoffwechselkrankheiten (DGVS), 2022.
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