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ICD-10-CM 2027 diagnosis code

K26.9Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

✓ Billable / specific

K26.9 is a valid, billable ICD-10-CM code for duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Duodenal ulcer, unsp as acute or chronic, w/o hemor or perf

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K26.9

K26.9 is the ICD-10-CM diagnosis code for duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation. It belongs to category K26 (duodenal ulcer), block K20-K31 (diseases of esophagus, stomach and duodenum) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K26, choose K26.9 (unspecified as acute or chronic, without hemorrhage or perforation) only when documentation doesn't support a more specific option: acute duodenal ulcer with hemorrhage (K26.0), acute duodenal ulcer with perforation (K26.1), acute duodenal ulcer with both hemorrhage and perforation (K26.2), acute duodenal ulcer without hemorrhage or perforation (K26.3), chronic or unspecified duodenal ulcer with hemorrhage (K26.4), chronic or unspecified duodenal ulcer with perforation (K26.5), chronic or unspecified duodenal ulcer with both hemorrhage and perforation (K26.6) and chronic duodenal ulcer without hemorrhage or perforation (K26.7).

Use an additional code to identify: alcohol abuse and dependence (F10.-).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 380 (Complicated Peptic Ulcer with MCC, relative weight 1.9245), DRG 381 (Complicated Peptic Ulcer with CC, relative weight 1.0838), DRG 382 (Complicated Peptic Ulcer without CC/MCC, relative weight 0.7281), DRG 383 (Uncomplicated Peptic Ulcer with MCC, relative weight 1.3536) and DRG 384 (Uncomplicated Peptic Ulcer without MCC, relative weight 0.8469), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 532.90 (duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation, without mention of obstruction).

Notes that apply from higher levels

Instructions written at a parent level also apply to K26.9.

› From K26 Duodenal ulcer
Includes
  • erosion (acute) of duodenum
  • duodenum ulcer (peptic)
  • postpyloric ulcer (peptic)
Excludes1
  • peptic ulcer NOS (K27.-)
Use additional code
  • code to identify:
  • alcohol abuse and dependence (F10.-)

Broader instructions also apply from K20-K31 Diseases of esophagus, stomach and duodenum and Chapter 11: Diseases of the digestive system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to K26.9.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 532.90Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation, without mention of obstructionapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about K26.9

Is K26.9 billable?

Yes. K26.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K26.9 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K26.9 as a principal diagnosis.

Is K26.9 a CC or MCC?

No. K26.9 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does K26.9 group to?

K26.9 is used in the MS-DRG v44.0 logic for MS-DRG 380 (Complicated Peptic Ulcer with MCC), MS-DRG 381 (Complicated Peptic Ulcer with CC), MS-DRG 382 (Complicated Peptic Ulcer without CC/MCC), MS-DRG 383 (Uncomplicated Peptic Ulcer with MCC) and MS-DRG 384 (Uncomplicated Peptic Ulcer without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for K26.9?

The CMS General Equivalence Mappings map K26.9 to ICD-9-CM 532.90.