ICD-10 Diagnosis Code J18.9

Pneumonia, unspecified organism

Diagnosis Code J18.9

ICD-10: J18.9
Short Description: Pneumonia, unspecified organism
Long Description: Pneumonia, unspecified organism
This is the 2018 version of the ICD-10-CM diagnosis code J18.9

Valid for Submission
The code J18.9 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the respiratory system (J00–J99)
    • Influenza and pneumonia (J09-J18)
      • Pneumonia, unspecified organism (J18)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code J18.9 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Acute erosive gastritis
  • Acute gastritis
  • Acute gastroenteritis
  • Acute mucous pneumonia
  • Acute ulcerative gastroenteritis complicating pneumonia
  • Atypical pneumonia
  • Bilateral pneumonia
  • Chlamydophila psittaci infection
  • Chronic pneumonia
  • Community acquired pneumonia
  • Erosive gastritis
  • Foreign body pneumonia
  • Healthcare associated pneumonia
  • Hemorrhagic pneumonia
  • Infectious disease of lung
  • Infective pneumonia
  • Non-infectious pneumonia
  • Nosocomial infectious disease
  • Nosocomial pneumonia
  • Ornithosis
  • Ornithosis with pneumonia
  • Pleural effusion associated with pulmonary infection
  • Pneumonia
  • Pneumonia associated with acquired immunodeficiency syndrome
  • Pneumonitis
  • Postoperative pneumonia
  • Recurrent pneumonia
  • Respiratory disorder associated with acquired immunodeficiency syndrome
  • Unresolved pneumonia

Information for Patients


Also called: Bronchopneumonia

Pneumonia is an infection in one or both of the lungs. Many germs, such as bacteria, viruses, and fungi, can cause pneumonia. You can also get pneumonia by inhaling a liquid or chemical. People most at risk are older than 65 or younger than 2 years of age, or already have health problems.

Symptoms of pneumonia vary from mild to severe. See your doctor promptly if you

  • Have a high fever
  • Have shaking chills
  • Have a cough with phlegm that doesn't improve or gets worse
  • Develop shortness of breath with normal daily activities
  • Have chest pain when you breathe or cough
  • Feel suddenly worse after a cold or the flu

Your doctor will use your medical history, a physical exam, and lab tests to diagnose pneumonia. Treatment depends on what kind you have. If bacteria are the cause, antibiotics should help. If you have viral pneumonia, your doctor may prescribe an antiviral medicine to treat it.

Preventing pneumonia is always better than treating it. Vaccines are available to prevent pneumococcal pneumonia and the flu. Other preventive measures include washing your hands frequently and not smoking.

NIH: National Heart, Lung, and Blood Institute

  • Aspiration pneumonia (Medical Encyclopedia)
  • Atypical pneumonia (Medical Encyclopedia)
  • Hospital-acquired pneumonia (Medical Encyclopedia)
  • Mycoplasma pneumonia (Medical Encyclopedia)
  • Pneumonia (Medical Encyclopedia)
  • Pneumonia - adults - discharge (Medical Encyclopedia)
  • Pneumonia - children - community acquired (Medical Encyclopedia)
  • Pneumonia - children - discharge (Medical Encyclopedia)
  • Viral pneumonia (Medical Encyclopedia)

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