DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K26 Duodenal ulcer

  • Header · not billable

K26 is not billable. The category heads 9 billable codes in FY2027: the 9 codes directly below it.

Index → code

  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic) → K26.9
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)acute → K26.3
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)chronic (erosive) → K26.7

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K20-K31 Diseases of esophagus, stomach and duodenum (K20-K31)
  3. K26 Duodenal ulcer
Billable codes
9
Subdivisions
9
CC / MCC codes
1 / 6
HCC V28 codes
4
New FY2027
0
Index entries
12

Codes in K26

  1. K26.0
    Acute duodenal ulcer with hemorrhage
    BillableMCC
  2. K26.1
    Acute duodenal ulcer with perforation
    BillableMCC78
  3. K26.2
    Acute duodenal ulcer with both hemorrhage and perforation
    BillableMCC78
  4. K26.3
    Acute duodenal ulcer without hemorrhage or perforation
    BillableCC
  5. K26.4
    Chronic or unspecified duodenal ulcer with hemorrhage
    BillableMCC
  6. K26.5
    Chronic or unspecified duodenal ulcer with perforation
    BillableMCC78
  7. K26.6
    Chronic or unspecified duodenal ulcer with both hemorrhage and perforation
    BillableMCC78
  8. K26.7
    Chronic duodenal ulcer without hemorrhage or perforation
    Billable
  9. K26.9
    Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At K26

Includes

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

Excludes1

  • peptic ulcer NOS (K27.-) K27

Use additional code

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

Notes that also apply

Block K20-K31 instructions (Excludes2 1): printed on the block page.

Chapter 11 instructions (Excludes2 8): printed on the chapter 11 page.

Index entries

  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic) → K26.9
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)acute → K26.3
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)chronic (erosive) → K26.7
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)withhemorrhage → K26.4
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)withperforation → K26.5
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)acutewithhemorrhage → K26.0
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)acutewithperforation → K26.1
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)chronic (erosive)withhemorrhage → K26.4
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)chronic (erosive)withperforation → K26.5
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)withhemorrhageand perforation → K26.6
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)acutewithhemorrhageand perforation → K26.2
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic)chronic (erosive)withhemorrhageand perforation → K26.6

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy