2026 ICD-10-CM Diagnosis Code J15.5Pneumonia due to Escherichia coli

ICD-10-CM Codes›J00–J99›J09-J18›J15

ICD-10-CM J15.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J15.5 is a billable ICD-10-CM diagnosis code for pneumonia due to Escherichia coli. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 177 through 179, 974 through 976. Coders also document this condition as bronchopneumonia caused by Escherichia coli. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Pneumonia (except that caused by tuberculosis).

Code Identity

ICD-10-CM Code
J15.5
Billable Status
Yes — Valid for Submission
Code Describes
Pneumonia due to Escherichia coli
Short Description
Pneumonia due to Escherichia coli
Same as the full description in the CMS dataset.
Parent Code
J15
Bacterial pneumonia, not elsewhere classified

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ09-J18Influenza and pneumonia
CategoryJ15Bacterial pneumonia, not elsewhere classified
This CodeJ15.5Pneumonia due to Escherichia coli

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bronchopneumonia caused by Escherichia coli
  • Pneumonia caused by Escherichia coli

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal)
        • Escherichia coli (E. coli)
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • Escherichia coli (E. coli)
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • in (due to)
        • Escherichia coli (E. coli)
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • lobar (disseminated) (double) (interstitial)
        • Escherichia coli (E. coli)

Clinical ClassificationClinical

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

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient No · outpatient No
CCSR RSP002
Pneumonia (except that caused by tuberculosis)
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

E. Coli Infections

E. coli is the name of a type of bacteria that lives in your intestines. Most types of E. coli are harmless. However, some types can make you sick and cause diarrhea. One type causes travelers' diarrhea. The worst type of E. coli causes bloody diarrhea, and can sometimes cause kidney failure and even death.

Read the full article at MedlinePlus

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

Convert J15.5 to ICD-9-CMHistory

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

ICD-9-CM
482.82 Pneumonia e coli
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J15.5Overview

Is J15.5 (Bacterial pneumonia, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pneumonia due to Escherichia coli on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J15.5 group to?

When pneumonia due to Escherichia coli is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, 974, 975, 976, with relative weights from 0.7550 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J15.5?

Under the General Equivalence Mappings, pneumonia due to Escherichia coli converts to ICD-9-CM 482.82 (pneumonia e coli). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.