2026 ICD-10-CM Diagnosis Code J85.0Gangrene and necrosis of lung

ICD-10-CM Codes›J00–J99›J85-J86›J85

ICD-10-CM J85.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J85.0 is a billable ICD-10-CM diagnosis code for gangrene and necrosis of lung. 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. Coders also document this condition as gangrenous pneumonia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gangrene.

Code Identity

ICD-10-CM Code
J85.0
Billable Status
Yes — Valid for Submission
Code Describes
Gangrene and necrosis of lung
Short Description
Gangrene and necrosis of lung
Same as the full description in the CMS dataset.
Parent Code
J85
Abscess of lung and mediastinum

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ85-J86Suppurative and necrotic conditions of the lower respiratory tract
CategoryJ85Abscess of lung and mediastinum
This CodeJ85.0Gangrene and necrosis of lung

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Gangrenous pneumonia
  • Pulmonary gangrene
  • Pulmonary necrosis

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.

    • Gangrene, gangrenous(connective tissue) (dropsical) (dry) (moist) (skin) (ulcer)
      • lung
    • Gangrene, gangrenous(connective tissue) (dropsical) (dry) (moist) (skin) (ulcer)
      • pulmonary
    • Necrosis, necrotic(ischemic)
      • lung
    • Necrosis, necrotic(ischemic)
      • pulmonary
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • gangrenous
    • Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
      • necrotic

Clinical ClassificationClinical

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

CCSR CIR028
Gangrene
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Gangrene

Gangrene is the death of tissues in your body. It happens when a part of your body loses its blood supply. Gangrene can happen on the surface of the body, such as on the skin, or inside the body, in muscles or organs. Causes include:

Read the full article at MedlinePlus

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

Convert J85.0 to ICD-9-CMHistory

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

ICD-9-CM
513.0 Abscess of lung
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J85.0Overview

Is J85.0 (Abscess of lung and mediastinum) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report gangrene and necrosis of lung on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J85.0 group to?

When gangrene and necrosis of lung is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, with relative weights from 0.7550 to 1.5627 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J85.0?

Under the General Equivalence Mappings, gangrene and necrosis of lung converts to ICD-9-CM 513.0 (abscess of lung). The mapping is approximate, so confirm the match fits the documentation.

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.