Alphabetic Index FY2027

K26

Duodenal ulcer

FY2027Chapter 11: Diseases of the digestive system/K20–K31 Diseases of esophagus, stomach and duodenum

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

K26 is a non-billable ICD-10-CM code category for duodenal ulcer. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are 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 and 5 more. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 9 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

This code
  • code to identify:
    • alcohol abuse and dependence (F10.-)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (9 notes)
Inherited from K20–K31 Diseases of esophagus, stomach and duodenum
Inherited from Chapter 11 Diseases of the digestive system
  • 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)

Includes

Further defines or gives examples of the content of the category.

This code
  • erosion (acute) of duodenum
  • duodenum ulcer (peptic)
  • postpyloric ulcer (peptic)

More specific codes under K26 9