ICD-10-CM Section · K20-K31
Diseases of esophagus, stomach and duodenum
135 codes in this section
135
Total Codes
105
Billable
30
Header (Non-Billable)
11
Top-Level Codes
About Section K20-K31
Section K20-K31 (K20-K31) covers diseases of esophagus, stomach and duodenum. It sits within the Diseases of the digestive system chapter (K00-K95). This section contains 135 ICD-10-CM codes, 105 billable diagnoses you can submit on a claim, and 30 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in K20-K31
Grouped by 3-character root code. Click any code for full detail.
K20
Esophagitis
7 subcodes
| K20.0 | Eosinophilic esophagitis | Billable |
| K20.8 | Other esophagitis | Header |
| K20.80 | Other esophagitis without bleeding | Billable |
| K20.81 | Other esophagitis with bleeding | Billable |
| K20.9 | Esophagitis, unspecified | Header |
| K20.90 | Esophagitis, unspecified without bleeding | Billable |
| K20.91 | Esophagitis, unspecified with bleeding | Billable |
K21
Gastro-esophageal reflux disease
4 subcodes
| K21.0 | Gastro-esophageal reflux disease with esophagitis | Header |
| K21.00 | Gastro-esophageal reflux disease with esophagitis, without bleeding | Billable |
| K21.01 | Gastro-esophageal reflux disease with esophagitis, with bleeding | Billable |
| K21.9 | Gastro-esophageal reflux disease without esophagitis | Billable |
K22
Other diseases of esophagus
20 subcodes
| K22.0 | Achalasia of cardia | Billable |
| K22.1 | Ulcer of esophagus | Header |
| K22.10 | Ulcer of esophagus without bleeding | Billable |
| K22.11 | Ulcer of esophagus with bleeding | Billable |
| K22.2 | Esophageal obstruction | Billable |
| K22.3 | Perforation of esophagus | Billable |
| K22.4 | Dyskinesia of esophagus | Billable |
| K22.5 | Diverticulum of esophagus, acquired | Billable |
| K22.6 | Gastro-esophageal laceration-hemorrhage syndrome | Billable |
| K22.7 | Barrett's esophagus | Header |
| K22.70 | Barrett's esophagus without dysplasia | Billable |
| K22.71 | Barrett's esophagus with dysplasia | Header |
| K22.710 | Barrett's esophagus with low grade dysplasia | Billable |
| K22.711 | Barrett's esophagus with high grade dysplasia | Billable |
| K22.719 | Barrett's esophagus with dysplasia, unspecified | Billable |
| K22.8 | Other specified diseases of esophagus | Header |
| K22.81 | Esophageal polyp | Billable |
| K22.82 | Esophagogastric junction polyp | Billable |
| K22.89 | Other specified disease of esophagus | Billable |
| K22.9 | Disease of esophagus, unspecified | Billable |
K23
Disorders of esophagus in diseases classified elsewhere
0 subcodes
K25
Gastric ulcer
9 subcodes
| K25.0 | Acute gastric ulcer with hemorrhage | Billable |
| K25.1 | Acute gastric ulcer with perforation | Billable |
| K25.2 | Acute gastric ulcer with both hemorrhage and perforation | Billable |
| K25.3 | Acute gastric ulcer without hemorrhage or perforation | Billable |
| K25.4 | Chronic or unspecified gastric ulcer with hemorrhage | Billable |
| K25.5 | Chronic or unspecified gastric ulcer with perforation | Billable |
| K25.6 | Chronic or unspecified gastric ulcer with both hemorrhage and perforation | Billable |
| K25.7 | Chronic gastric ulcer without hemorrhage or perforation | Billable |
| K25.9 | Gastric ulcer, unspecified as acute or chronic, without hemorrhage or perforation | Billable |
K26
Duodenal ulcer
9 subcodes
| K26.0 | Acute duodenal ulcer with hemorrhage | Billable |
| K26.1 | Acute duodenal ulcer with perforation | Billable |
| K26.2 | Acute duodenal ulcer with both hemorrhage and perforation | Billable |
| K26.3 | Acute duodenal ulcer without hemorrhage or perforation | Billable |
| K26.4 | Chronic or unspecified duodenal ulcer with hemorrhage | Billable |
| K26.5 | Chronic or unspecified duodenal ulcer with perforation | Billable |
| K26.6 | Chronic or unspecified duodenal ulcer with both hemorrhage and perforation | Billable |
| K26.7 | Chronic duodenal ulcer without hemorrhage or perforation | Billable |
| K26.9 | Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation | Billable |
K27
Peptic ulcer, site unspecified
9 subcodes
| K27.0 | Acute peptic ulcer, site unspecified, with hemorrhage | Billable |
| K27.1 | Acute peptic ulcer, site unspecified, with perforation | Billable |
| K27.2 | Acute peptic ulcer, site unspecified, with both hemorrhage and perforation | Billable |
| K27.3 | Acute peptic ulcer, site unspecified, without hemorrhage or perforation | Billable |
| K27.4 | Chronic or unspecified peptic ulcer, site unspecified, with hemorrhage | Billable |
| K27.5 | Chronic or unspecified peptic ulcer, site unspecified, with perforation | Billable |
| K27.6 | Chronic or unspecified peptic ulcer, site unspecified, with both hemorrhage and perforation | Billable |
| K27.7 | Chronic peptic ulcer, site unspecified, without hemorrhage or perforation | Billable |
| K27.9 | Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation | Billable |
K28
Gastrojejunal ulcer
9 subcodes
| K28.0 | Acute gastrojejunal ulcer with hemorrhage | Billable |
| K28.1 | Acute gastrojejunal ulcer with perforation | Billable |
| K28.2 | Acute gastrojejunal ulcer with both hemorrhage and perforation | Billable |
| K28.3 | Acute gastrojejunal ulcer without hemorrhage or perforation | Billable |
| K28.4 | Chronic or unspecified gastrojejunal ulcer with hemorrhage | Billable |
| K28.5 | Chronic or unspecified gastrojejunal ulcer with perforation | Billable |
| K28.6 | Chronic or unspecified gastrojejunal ulcer with both hemorrhage and perforation | Billable |
| K28.7 | Chronic gastrojejunal ulcer without hemorrhage or perforation | Billable |
| K28.9 | Gastrojejunal ulcer, unspecified as acute or chronic, without hemorrhage or perforation | Billable |
K29
Gastritis and duodenitis
27 subcodes
| K29.0 | Acute gastritis | Header |
| K29.00 | Acute gastritis without bleeding | Billable |
| K29.01 | Acute gastritis with bleeding | Billable |
| K29.2 | Alcoholic gastritis | Header |
| K29.20 | Alcoholic gastritis without bleeding | Billable |
| K29.21 | Alcoholic gastritis with bleeding | Billable |
| K29.3 | Chronic superficial gastritis | Header |
| K29.30 | Chronic superficial gastritis without bleeding | Billable |
| K29.31 | Chronic superficial gastritis with bleeding | Billable |
| K29.4 | Chronic atrophic gastritis | Header |
| K29.40 | Chronic atrophic gastritis without bleeding | Billable |
| K29.41 | Chronic atrophic gastritis with bleeding | Billable |
| K29.5 | Unspecified chronic gastritis | Header |
| K29.50 | Unspecified chronic gastritis without bleeding | Billable |
| K29.51 | Unspecified chronic gastritis with bleeding | Billable |
| K29.6 | Other gastritis | Header |
| K29.60 | Other gastritis without bleeding | Billable |
| K29.61 | Other gastritis with bleeding | Billable |
| K29.7 | Gastritis, unspecified | Header |
| K29.70 | Gastritis, unspecified, without bleeding | Billable |
| K29.71 | Gastritis, unspecified, with bleeding | Billable |
| K29.8 | Duodenitis | Header |
| K29.80 | Duodenitis without bleeding | Billable |
| K29.81 | Duodenitis with bleeding | Billable |
| K29.9 | Gastroduodenitis, unspecified | Header |
| K29.90 | Gastroduodenitis, unspecified, without bleeding | Billable |
| K29.91 | Gastroduodenitis, unspecified, with bleeding | Billable |
K30
Functional dyspepsia
0 subcodes
K31
Other diseases of stomach and duodenum
30 subcodes
| K31.0 | Acute dilatation of stomach | Billable |
| K31.1 | Adult hypertrophic pyloric stenosis | Billable |
| K31.2 | Hourglass stricture and stenosis of stomach | Billable |
| K31.3 | Pylorospasm, not elsewhere classified | Billable |
| K31.4 | Gastric diverticulum | Billable |
| K31.5 | Obstruction of duodenum | Billable |
| K31.6 | Fistula of stomach and duodenum | Billable |
| K31.7 | Polyp of stomach and duodenum | Billable |
| K31.8 | Other specified diseases of stomach and duodenum | Header |
| K31.81 | Angiodysplasia of stomach and duodenum | Header |
| K31.811 | Angiodysplasia of stomach and duodenum with bleeding | Billable |
| K31.819 | Angiodysplasia of stomach and duodenum without bleeding | Billable |
| K31.82 | Dieulafoy lesion (hemorrhagic) of stomach and duodenum | Billable |
| K31.83 | Achlorhydria | Billable |
| K31.84 | Gastroparesis | Billable |
| K31.89 | Other diseases of stomach and duodenum | Billable |
| K31.9 | Disease of stomach and duodenum, unspecified | Billable |
| K31.A | Gastric intestinal metaplasia | Header |
| K31.A0 | Gastric intestinal metaplasia, unspecified | Billable |
| K31.A1 | Gastric intestinal metaplasia without dysplasia | Header |
| K31.A11 | Gastric intestinal metaplasia without dysplasia, involving the antrum | Billable |
| K31.A12 | Gastric intestinal metaplasia without dysplasia, involving the body (corpus) | Billable |
| K31.A13 | Gastric intestinal metaplasia without dysplasia, involving the fundus | Billable |
| K31.A14 | Gastric intestinal metaplasia without dysplasia, involving the cardia | Billable |
| K31.A15 | Gastric intestinal metaplasia without dysplasia, involving multiple sites | Billable |
| K31.A19 | Gastric intestinal metaplasia without dysplasia, unspecified site | Billable |
| K31.A2 | Gastric intestinal metaplasia with dysplasia | Header |
| K31.A21 | Gastric intestinal metaplasia with low grade dysplasia | Billable |
| K31.A22 | Gastric intestinal metaplasia with high grade dysplasia | Billable |
| K31.A29 | Gastric intestinal metaplasia with dysplasia, unspecified | Billable |
Did this page help?
Quick signal so we know what to improve.
Thanks!
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Sorry to hear that.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team