2027 ICD-10-CM Diagnosis Code K27Peptic ulcer, site unspecified

ICD-10-CM Codes›K00–K95›K20-K31›K27

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

K27 is a non-billable ICD-10-CM category code for peptic ulcer, site unspecified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as K27.0, K27.1, K27.2, and K27.3.

Code Identity

ICD-10-CM Code
K27
Billable Status
No — Non-Billable Category
Code Describes
Peptic ulcer, site unspecified
Short Description
Peptic ulcer, site unspecified
Same as the full description in the CMS dataset.
Chapter
K20-K31
Diseases of esophagus, stomach and duodenum

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK27Peptic ulcer, site unspecified
This CodeK27Peptic ulcer, site unspecified

Specific Coding for Peptic ulcer, site unspecifiedOverview

Non-specific codes like K27 require more characters. Use one of these billable codes instead:

  • Use K27.0 for Acute peptic ulcer, site unspecified, with hemorrhage

  • Use K27.1 for Acute peptic ulcer, site unspecified, with perforation

  • Use K27.2 for Acute peptic ulcer, site unspecified, with both hemorrhage and perforation

  • Use K27.3 for Acute peptic ulcer, site unspecified, without hemorrhage or perforation

  • Use K27.4 for Chronic or unspecified peptic ulcer, site unspecified, with hemorrhage

  • Use K27.5 for Chronic or unspecified peptic ulcer, site unspecified, with perforation

  • Use K27.6 for Chronic or unspecified peptic ulcer, site unspecified, with both hemorrhage and perforation

  • Use K27.7 for Chronic peptic ulcer, site unspecified, without hemorrhage or perforation

  • Use K27.9 for Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K27: its own notes plus those printed at 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.

  • 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.

  • 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.

  • 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, its category, or a range that includes it.

Excludes1 4

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

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

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.

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 K27Overview

What is the ICD-10 code for peptic ulcer, site unspecified?

K27 is the ICD-10-CM category for peptic ulcer, site unspecified, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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

No. This is a category header that groups the codes for peptic ulcer, site unspecified, and headers cannot be submitted on claims. Claims for peptic ulcer, site unspecified need a more specific code from this category, such as K27.0, K27.1, and K27.2.

Can K27 be reported with P78.82?

Not as a rule. The Excludes1 note on K27 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 need an additional code?

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