Duodenal ulcer (K26) ICD-10-CM
The K26 code range covers duodenal ulcer with 10 ICD-10-CM diagnosis codes. 9 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- erosion (acute) of duodenum
- duodenum ulcer (peptic)
- postpyloric ulcer (peptic)
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
- code to identify:
- alcohol abuse and dependence F10
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- peptic ulcer NOS K27
Codes in the K26 Range 10 codes · 9 billable
- K26 Duodenal ulcerNon-billable
- 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K26 range.
Duodenal Ulcer
A PEPTIC ULCER located in the DUODENUM.
About the K26 Code Range
A duodenal ulcer is a peptic ulcer in the duodenum, part of the digestive system.
K26 separates ulcers labeled acute from those labeled chronic or unspecified. Its subdivisions then distinguish bleeding, perforation (a hole), both, or neither. When neither is present, K26.7 specifies chronic ulcer, while K26.9 leaves acute or chronic status unspecified.
Questions About This Page
How many billable codes are in the K26 range?
Of the 10 codes in this range, 9 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the K26 range classify?
The range classifies duodenal ulcer. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
