Chapter 11

K00–K95: Diseases of the Digestive System

Diseases of the Digestive System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

All Codes Billable Only

Internal Codes

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K29.81|
Duodenitis with bleeding
K29.9|
Gastroduodenitis, unspecified
K29.90|
Gastroduodenitis, unspecified, without bleeding
K29.91|
Gastroduodenitis, unspecified, with bleeding
K30|
Functional dyspepsia
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
K35|
Acute appendicitis
K35.2|
Acute appendicitis with generalized peritonitis
K35.20|
Acute appendicitis with generalized peritonitis, without abscess
K35.200|
Acute appendicitis with generalized peritonitis, without perforation or abscess
K35.201|
Acute appendicitis with generalized peritonitis, with perforation, without abscess
K35.209|
Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation
K35.21|
Acute appendicitis with generalized peritonitis, with abscess
K35.210|
Acute appendicitis with generalized peritonitis, without perforation, with abscess
K35.211|
Acute appendicitis with generalized peritonitis, with perforation and abscess
K35.219|
Acute appendicitis with generalized peritonitis, with abscess, unspecified as to perforation
K35.3|
Acute appendicitis with localized peritonitis
K35.30|
Acute appendicitis with localized peritonitis, without perforation or gangrene
K35.31|
Acute appendicitis with localized peritonitis and gangrene, without perforation
K35.32|
Acute appendicitis with perforation, localized peritonitis, and gangrene, without abscess

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