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K20: Oesophagitis
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K21: Gastro-oesophageal reflux disease
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K22: Other diseases of oesophagus
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K23*: Disorders of oesophagus in diseases classified elsewhere
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K25: Gastric ulcer
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K26: Duodenal ulcer
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K27: Peptic ulcer, site unspecified
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K28: Gastrojejunal ulcer
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K29: Gastritis and duodenitis
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K30: Functional dyspepsia
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K31: Other diseases of stomach and duodenum
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