2026 ICD-10-CM Diagnosis Code J18.0Bronchopneumonia, unspecified organism
ICD-10-CM Codes›J00–J99›J09-J18›J18
- Billable — Valid for Submission
- Not Chronic
J18.0 is a billable ICD-10-CM diagnosis code for bronchopneumonia, unspecified organism. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 193 through 195. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pneumonia (except that caused by tuberculosis).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abscess of lung
- Abscess of lung with pneumonia
- Acute bronchopneumonia
- Bilateral bronchopneumonia
- Bilateral pneumonia
- Bronchial hemorrhage
- Bronchopneumonia
- Bronchopneumonia caused by anaerobic bacteria
- Bronchopneumonia due to virus
- Confluent bronchopneumonia with abscess formation
- Confluent pneumonia
- Gangrenous pneumonia
- Hemorrhagic bronchopneumonia
- Hemorrhagic pneumonia
- Influenzal bronchopneumonia
- Necrosis of bronchus
- Necrotizing bronchopneumonia
- Peribronchial pneumonia
- Pleurobronchopneumonia
- Pneumonia and influenza
- Pneumonia caused by anaerobic bacteria
- Pneumonia caused by influenza virus
- Pulmonary necrosis
- Terminal bronchopneumonia
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
Type 2 Excludes
- acute bronchiolitis J21
- chronic bronchiolitis J44.89
- other specified chronic obstructive pulmonary disease J44.89
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Bronchoalveolitis - J18.0
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Bronchoalveolitis
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Bronchopneumonia
inflammation of the lung parenchyma that is associated with bronchitis, usually involving lobular areas from terminal bronchioles to the pulmonary alveoli. the affected areas become filled with exudate that forms consolidated patches.
Patient EducationClinical
Pneumonia
Pneumonia is an infection in one or both of your lungs. It causes the air sacs of your lungs to fill up with fluid or pus. Pneumonia can range from mild to severe, depending on what caused it, your age, and your overall health.
The full article covers:
- What is pneumonia?
- What causes pneumonia?
- Who is more likely to develop pneumonia?
- What are the symptoms of pneumonia?
- What other problems can pneumonia cause?
- How is pneumonia diagnosed?
- What are the treatments for pneumonia?
- Can pneumonia be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert J18.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J18.0Overview
Is J18.0 (Pneumonia, unspecified organism) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report bronchopneumonia, unspecified organism on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J18.0 group to?
When bronchopneumonia, unspecified organism is the principal diagnosis on an inpatient stay, it groups to MS-DRG 193, 194, 195, with relative weights from 0.6285 to 1.3144 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of J18.0?
Under the General Equivalence Mappings, bronchopneumonia, unspecified organism converts to ICD-9-CM 485 (bronchopneumonia org NOS). 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.
