2027 ICD-10-CM Diagnosis Code K27.9Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation

ICD-10-CM Codes›K00–K95›K20-K31›K27

ICD-10-CM K27.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K27.9 is a billable ICD-10-CM diagnosis code for peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 380 through 384. Coders also document this condition as drug-induced peptic ulcer. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastroduodenal ulcer.

Code Identity

ICD-10-CM Code
K27.9
Billable Status
Yes — Valid for Submission
Code Describes
Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation
Short Description
Peptic ulc, site unsp, unsp as ac or chr, w/o hemor or perf
Parent Code
K27
Peptic ulcer, site unspecified

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK27Peptic ulcer, site unspecified
This CodeK27.9Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Drug-induced peptic ulcer
  • Exacerbation of peptic ulcer
  • Peptic anastomotic ulcer
  • Peptic ulcer
  • Peptic ulcer with obstruction
  • Peptic ulcer without hemorrhage AND without perforation
  • Peptic ulcer without hemorrhage AND without perforation but with obstruction
  • Peptic ulcer without hemorrhage, without perforation AND without obstruction
  • Stress ulcer
  • Stress ulcer of stomach

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K27.9: its own notes plus those printed at K27, block K20-K31, and Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From K27 Peptic ulcer, site unspecified applies to 9 codes
  • gastroduodenal ulcer NOS
  • peptic ulcer NOS

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From K27 Peptic ulcer, site unspecified applies to 9 codes
  • peptic ulcer of newborn (P78.82)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block K20-K31 Diseases of esophagus, stomach and duodenum applies to 106 codes
From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From K27 Peptic ulcer, site unspecified applies to 9 codes
  • code to identify:
  • alcohol abuse and dependence (F10.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K27.9, its category, or a range that includes it.

Excludes1 4

These codes carry an Excludes1 note naming K27.9: they are not reported together with it, unless the two conditions are unrelated.

  • K25 Gastric ulcer
    peptic ulcer NOS (K27.-) names K27.-, which includes this code
  • K26 Duodenal ulcer
    peptic ulcer NOS (K27.-) names K27.-, which includes this code
  • K63.3 Ulcer of intestine
    peptic ulcer, site unspecified (K27.-) names K27.-, which includes this code
  • K92.2 Gastrointestinal hemorrhage, unspecified
    peptic ulcer with hemorrhage (K25-K28) names K25-K28, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG005
Gastroduodenal ulcer
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Peptic Ulcer

    ulcer that occurs in the regions of the gastrointestinal tract which come into contact with gastric juice containing pepsin and gastric acid. it occurs when there are defects in the mucosa barrier. the common forms of peptic ulcers are associated with helicobacter pylori and the consumption of nonsteroidal anti-inflammatory drugs (nsaids).

Patient EducationClinical

Peptic Ulcer

A peptic ulcer is a sore in the lining of your stomach or your duodenum, the first part of your small intestine. A burning stomach pain is the most common symptom. The pain:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K27.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
533.90 Peptic ulcer NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K27.9Overview

Is K27.9 (Peptic ulcer, site unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does K27.9 group to?

When peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation is the principal diagnosis on an inpatient stay, it groups to MS-DRG 381, 380, 383, 384, 382, with relative weights from 0.7283 to 1.9243 depending on complications. Higher weights mean higher Medicare reimbursement.

Can K27.9 be reported with P78.82?

Not as a rule. The Excludes1 note at K27, which applies to K27.9, lists "peptic ulcer of newborn (P78.82)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does K27.9 need an additional code?

When the condition applies, yes. The Use Additional Code note at K27, which applies to K27.9, reads: code to identify: alcohol abuse and dependence (F10.-). The additional code is reported after K27.9.

What is the ICD-9 equivalent of K27.9?

Under the General Equivalence Mappings, peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation converts to ICD-9-CM 533.90 (peptic ulcer NOS). The mapping is approximate, so confirm the match fits the documentation.