K26.1 Acute duodenal ulcer with perforation

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applies from K26 Duodenal ulcer

Includes

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

Excludes1 (never code together)

• peptic ulcer NOS (K27.-)

Use additional code

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

Risk adjustment (HCC)

• CMS-HCC V28: HCC 78 — Intestinal Obstruction/Perforation
• CMS-HCC V22: HCC 33 — Intestinal Obstruction/Perforation
• ESRD V24: HCC 33

MS-DRG index

Defines the logic of DRG(s) 380-382 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 532.10 Acute duodenal ulcer with perforation, without mention of obstruction (approximate)

Code annotations containing back-references to K26.1

Back-references to K26

• Type 1 Excludes: K63.1 Perforation of intestine (nontraumatic) ("perforation (nontraumatic) of duodenum (K26.-)")
• Type 1 Excludes: K63.3 Ulcer of intestine ("duodenal ulcer (K26.-)")
• Type 1 Excludes: K92.2 Gastrointestinal hemorrhage, unspecified ("peptic ulcer with hemorrhage (K25-K28)")

Diagnosis Index entries for K26.1

• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › duodenum, duodenal (eroded) (peptic) › acute › with › perforation

Nearby codes

• K26 Duodenal ulcer
• K26.0 Acute duodenal ulcer with hemorrhage
• K26.1 Acute duodenal ulcer with perforation (this code)
• 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