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K21.0 – GERD with Oesophagitis Explained
K21.0 is the ICD-10 code for gastro-oesophageal reflux disease (GERD) with oesophagitis, describing acid reflux into the oesophagus causing mucosal inflammation.
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K21.0 is the ICD-10 code for gastro-oesophageal reflux disease (GERD) with oesophagitis, describing acid reflux into the oesophagus causing mucosal inflammation.
What Does the ICD-10 Code K21.0 Mean?
The ICD-10 code K21.0 refers to gastro-oesophageal reflux disease (GERD) with oesophagitis. This condition occurs when stomach contents – particularly stomach acid – regularly flow back into the oesophagus, causing inflammation of the mucosal lining (oesophagitis). This distinguishes K21.0 from code K21.9, which describes reflux disease without evidence of oesophagitis.
Causes
GERD develops when the lower oesophageal sphincter (LOS) – a ring of muscle at the junction of the oesophagus and stomach – fails to close properly. Common causes and risk factors include:
- Hiatus hernia: part of the stomach protrudes through the diaphragm into the chest cavity
- Overweight and obesity
- Pregnancy
- Smoking and alcohol consumption
- Fatty, acidic, or heavily spiced foods
- Certain medications (e.g., calcium channel blockers, nitrates, anticholinergics)
- Stress and unhealthy lifestyle habits
Symptoms
The most common symptoms associated with K21.0 include:
- Heartburn: a burning sensation behind the breastbone, often after meals or when lying down
- Acid regurgitation: a sour or bitter taste in the mouth caused by stomach contents flowing back up
- Difficulty swallowing (dysphagia)
- Pain or pressure behind the breastbone
- Chronic cough, hoarseness, or sore throat (extra-oesophageal symptoms)
- In severe oesophagitis: mucosal bleeding or ulcerations
Diagnosis
Diagnosis is made using several investigative methods:
- Oesophagogastroduodenoscopy (upper endoscopy): gold standard for assessing the mucosal lining and grading oesophagitis (Los Angeles classification: Grade A–D)
- 24-hour pH monitoring or impedance-pH monitoring: measures acid exposure in the oesophagus over time
- Manometry: assesses lower oesophageal sphincter pressure
- Barium swallow X-ray: used to rule out accompanying structural conditions
Treatment
Lifestyle Modifications
- Weight loss in overweight individuals
- Quitting smoking and reducing alcohol intake
- Smaller, more frequent meals; avoiding acidic and fatty foods
- Elevating the head of the bed
- Avoiding eating within 2–3 hours of bedtime
Pharmacological Treatment
- Proton pump inhibitors (PPIs) (e.g., omeprazole, pantoprazole): first-line treatment – effectively suppress gastric acid production
- H2-receptor antagonists (e.g., famotidine): alternative or supplementary acid suppression
- Antacids: short-term relief of heartburn symptoms
- Prokinetics: promote gastric emptying and improve sphincter tone
Surgical Treatment
In cases of treatment-resistant disease or significant hiatus hernia, a fundoplication (laparoscopic surgery to reinforce the sphincter) may be considered.
Complications
If left untreated, K21.0 can lead to serious complications:
- Barrett oesophagus: changes to the mucosal lining of the oesophagus with increased risk of cancer
- Oesophageal stricture: narrowing of the oesophagus due to scar tissue formation
- Bleeding from the oesophageal mucosa
References
- Vakil N. et al. – The Montreal Definition and Classification of Gastroesophageal Reflux Disease. American Journal of Gastroenterology, 2006; 101(8): 1900–1920.
- Koop H. et al. – S2k Guideline: Gastroesophageal Reflux Disease. AWMF Registration No. 021-013, 2023. German Society of Gastroenterology, Digestive and Metabolic Diseases (DGVS).
- World Health Organization (WHO) – ICD-10 Version 2019, Chapter XI: Diseases of the Digestive System, Code K21.0.
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