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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  • K27.5|

    Chronic or unspecified peptic ulcer, site unspecified, with perforation

  • K27.6|

    Chronic or unspecified peptic ulcer, site unspecified, with both hemorrhage and perforation

  • K27.7|

    Chronic peptic ulcer, site unspecified, without hemorrhage or perforation

  • K27.9|

    Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation

  • K28.0|

    Acute gastrojejunal ulcer with hemorrhage

  • K28.1|

    Acute gastrojejunal ulcer with perforation

  • K28.2|

    Acute gastrojejunal ulcer with both hemorrhage and perforation

  • K28.3|

    Acute gastrojejunal ulcer without hemorrhage or perforation

  • K28.4|

    Chronic or unspecified gastrojejunal ulcer with hemorrhage

  • K28.5|

    Chronic or unspecified gastrojejunal ulcer with perforation

  • K28.6|

    Chronic or unspecified gastrojejunal ulcer with both hemorrhage and perforation

  • K28.7|

    Chronic gastrojejunal ulcer without hemorrhage or perforation

  • K28.9|

    Gastrojejunal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

  • K29.00|

    Acute gastritis without bleeding

  • K29.01|

    Acute gastritis with bleeding

  • K29.20|

    Alcoholic gastritis without bleeding

  • K29.21|

    Alcoholic gastritis with bleeding

  • K29.30|

    Chronic superficial gastritis without bleeding

  • K29.31|

    Chronic superficial gastritis with bleeding

  • K29.40|

    Chronic atrophic gastritis without bleeding

  • K29.41|

    Chronic atrophic gastritis with bleeding

  • K29.50|

    Unspecified chronic gastritis without bleeding

  • K29.51|

    Unspecified chronic gastritis with bleeding

  • K29.60|

    Other gastritis without bleeding

  • K29.61|

    Other gastritis with bleeding

  • K29.70|

    Gastritis, unspecified, without bleeding

  • K29.71|

    Gastritis, unspecified, with bleeding

  • K29.80|

    Duodenitis without bleeding

  • K29.81|

    Duodenitis with bleeding

  • K29.90|

    Gastroduodenitis, unspecified, without bleeding

  • K29.91|

    Gastroduodenitis, unspecified, with bleeding

  • K30|

    Functional dyspepsia

  • 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

  • K31.811|

    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.A0|

    Gastric intestinal metaplasia, unspecified

  • K31.A11|

    Gastric intestinal metaplasia without dysplasia, involving the antrum

  • K31.A12|

    Gastric intestinal metaplasia without dysplasia, involving the body (corpus)

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