Diseases of the digestive system (K00-K95)

Excludes 2:
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)

Diseases of esophagus, stomach and duodenum (K20-K31)

Excludes 2:
hiatus hernia (K44.-)
K20 Esophagitis [+]
Use additional code to identify:
Use additional alcohol abuse and dependence (F10.-)
Excludes 1: erosion of esophagus (K22.1-)
esophagitis with gastro-esophageal reflux disease (K21.0-)
reflux esophagitis (K21.0-)
ulcerative esophagitis (K22.1-)
Excludes 2: eosinophilic gastritis or gastroenteritis (K52.81)
K21 Gastro-esophageal reflux disease [+]
Excludes 1: newborn esophageal reflux (P78.83)
K22 Other diseases of esophagus [+]
Excludes 2: esophageal varices (I85.-)
K23 Disorders of esophagus in diseases classified elsewhere
Code first underlying disease, such as:
congenital syphilis (A50.5)
Excludes 1: late syphilis (A52.79)
megaesophagus due to Chagas' disease (B57.31)
tuberculosis (A18.83)
K25 Gastric ulcer [+]
Includes: erosion (acute) of stomach
pylorus ulcer (peptic)
stomach ulcer (peptic)
Use additional code to identify:
Use additional alcohol abuse and dependence (F10.-)
Excludes 1: acute gastritis (K29.0-)
peptic ulcer NOS (K27.-)
K26 Duodenal ulcer [+]
Includes: erosion (acute) of duodenum
duodenum ulcer (peptic)
postpyloric ulcer (peptic)
Use additional code to identify:
Use additional alcohol abuse and dependence (F10.-)
Excludes 1: peptic ulcer NOS (K27.-)
K27 Peptic ulcer, site unspecified [+]
Includes: gastroduodenal ulcer NOS
peptic ulcer NOS
Use additional code to identify:
Use additional alcohol abuse and dependence (F10.-)
Excludes 1: peptic ulcer of newborn (P78.82)
K28 Gastrojejunal ulcer [+]
Includes: anastomotic ulcer (peptic) or erosion
gastrocolic ulcer (peptic) or erosion
gastrointestinal ulcer (peptic) or erosion
gastrojejunal ulcer (peptic) or erosion
jejunal ulcer (peptic) or erosion
marginal ulcer (peptic) or erosion
stomal ulcer (peptic) or erosion
Use additional code to identify:
Use additional alcohol abuse and dependence (F10.-)
Excludes 1: primary ulcer of small intestine (K63.3)
K29 Gastritis and duodenitis [+]
Excludes 1: eosinophilic gastritis or gastroenteritis (K52.81)
Zollinger-Ellison syndrome (E16.4)
K30 Functional dyspepsia
Indigestion
Excludes 1: dyspepsia NOS (R10.13)
heartburn (R12)
nervous dyspepsia (F45.8)
neurotic dyspepsia (F45.8)
psychogenic dyspepsia (F45.8)
K31 Other diseases of stomach and duodenum [+]
Includes: functional disorders of stomach
Excludes 2: diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
diverticulum of duodenum (K57.00-K57.13)

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