K26
ICD-10Non-billable categoryDuodenal ulcer
Official ICD-10-CM descriptor (FY2026)
Duodenal ulcer
K26 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Includes
- erosion (acute) of duodenum
- duodenum ulcer (peptic)
- postpyloric ulcer (peptic)
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- peptic ulcer NOS (K27.-)
Use additional code
Report an additional code to identify the associated condition.
- code to identify:
- alcohol abuse and dependence (F10.-)
More specific codes under K26
- K26.0Acute duodenal ulcer with hemorrhage
- K26.1Acute duodenal ulcer with perforation
- K26.2Acute duodenal ulcer with both hemorrhage and perforation
- K26.3Acute duodenal ulcer without hemorrhage or perforation
- K26.4Chronic or unspecified duodenal ulcer with hemorrhage
- K26.5Chronic or unspecified duodenal ulcer with perforation
- K26.6Chronic or unsp duodenal ulcer w both hemorrhage and perf
- K26.7Chronic duodenal ulcer without hemorrhage or perforation
- K26.9Duodenal ulcer, unsp as acute or chronic, w/o hemor or perf
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.