All ICD10 Codes
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 CodesBillable 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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