Coding and coverage · ICD-10-CM

K26 Duodenal ulcer

Not billable (header)Chapter 11

Report one of the more specific codes below.

Check coverage with this diagnosis

Codes under this one

  • K26.0 Acute duodenal ulcer with hemorrhage
  • K26.1 Acute duodenal ulcer with perforation
  • K26.2 Acute duodenal ulcer with both hemorrhage and perforation
  • K26.3 Acute duodenal ulcer without hemorrhage or perforation
  • K26.4 Chronic or unspecified duodenal ulcer with hemorrhage
  • K26.5 Chronic or unspecified duodenal ulcer with perforation
  • K26.6 Chronic or unspecified duodenal ulcer with both hemorrhage and perforation
  • K26.7 Chronic duodenal ulcer without hemorrhage or perforation
  • K26.9 Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

Instructional notes

Chapter 11

Excludes2Not included here: the patient may have both; report both when both are present.
  • 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)

Section K20-K31

Excludes2Not included here: the patient may have both; report both when both are present.

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
Use additional codeAdd a second code for the full picture.
  • code to identify:
  • alcohol abuse and dependence (F10.-)
Includes
  • erosion (acute) of duodenum
  • duodenum ulcer (peptic)
  • postpyloric ulcer (peptic)

Chapter 11: Diseases of the digestive system · K20-K31 Diseases of esophagus, stomach and duodenum (K20-K31)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.