K26 – Duodenal ulcer
ICD-10-CM 2027 diagnosis code · Diseases of esophagus, stomach and duodenum
ICD-10-CM code
K26
- Code
K26(claims format:K26)- Description
- Duodenal ulcer
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 11. Diseases of the digestive system (K00-K95)
- Block
- K20-K31 Diseases of esophagus, stomach and duodenum
Billable codes under K26
K26 is a header code and cannot be used on claims. Choose the most specific code:
- K26.0 – Acute duodenal ulcer with hemorrhageBillable
- K26.1 – Acute duodenal ulcer with perforationBillable
- K26.2 – Acute duodenal ulcer with both hemorrhage and perforationBillable
- K26.3 – Acute duodenal ulcer without hemorrhage or perforationBillable
- K26.4 – Chronic or unspecified duodenal ulcer with hemorrhageBillable
- K26.5 – Chronic or unspecified duodenal ulcer with perforationBillable
- K26.6 – Chronic or unspecified duodenal ulcer with both hemorrhage and perforationBillable
- K26.7 – Chronic duodenal ulcer without hemorrhage or perforationBillable
- K26.9 – Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforationBillable
Notes for K26
Includes:
- erosion (acute) of duodenum
- duodenum ulcer (peptic)
- postpyloric ulcer (peptic)
Excludes1 (not coded here):
- peptic ulcer NOS (K27.-)
Use additional code:
- code to identify:
- alcohol abuse and dependence (F10.-)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block K20-K31
Excludes2 (not included here):
- hiatus hernia (K44.-)
Frequently asked questions
What is ICD-10 code K26?
K26 is the ICD-10-CM code for duodenal ulcer, in the block K20-K31 (Diseases of esophagus, stomach and duodenum).
Is K26 a billable code?
No. K26 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.