2023 ICD-10-CM Diagnosis Code J18.9

Pneumonia, unspecified organism

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • J18.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM J18.9 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of J18.9 - other international versions of ICD-10 J18.9 may differ.
The following code(s) above J18.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to J18.9:
  • J00-J99
    2023 ICD-10-CM Range J00-J99

    Diseases of the respiratory system

    • When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).
    Type 2 Excludes
    • 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)
    • smoke inhalation (T59.81-)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Use Additional
    • code, where applicable, to identify:
    • exposure to environmental tobacco smoke (Z77.22)
    • exposure to tobacco smoke in the perinatal period (P96.81)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
    Diseases of the respiratory system
  • J09-J18
    2023 ICD-10-CM Range J09-J18

    Influenza and pneumonia

    Type 2 Excludes
    • allergic or eosinophilic pneumonia (J82)
    • aspiration pneumonia NOS (J69.0)
    • meconium pneumonia (P24.01)
    • neonatal aspiration pneumonia (P24.-)
    • pneumonia due to solids and liquids (J69.-)
    • congenital pneumonia (P23.9)
    • lipid pneumonia (J69.1)
    • rheumatic pneumonia (I00)
    • ventilator associated pneumonia (J95.851)
    Influenza and pneumonia
  • J18
    ICD-10-CM Diagnosis Code J18

    Pneumonia, unspecified organism

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Code First
    Type 1 Excludes
    • abscess of lung with pneumonia (J85.1)
    • aspiration pneumonia due to anesthesia during labor and delivery (O74.0)
    • aspiration pneumonia due to anesthesia during pregnancy (O29)
    • aspiration pneumonia due to anesthesia during puerperium (O89.0)
    • aspiration pneumonia due to solids and liquids (J69.-)
    • aspiration pneumonia NOS (J69.0)
    • congenital pneumonia (P23.0)
    • drug-induced interstitial lung disorder (J70.2-J70.4)
    • interstitial pneumonia NOS (J84.9)
    • lipid pneumonia (J69.1)
    • neonatal aspiration pneumonia (P24.-)
    • pneumonitis due to external agents (J67-J70)
    • pneumonitis due to fumes and vapors (J68.0)
    • usual interstitial pneumonia (J84.178)
    Pneumonia, unspecified organism
Approximate Synonyms
  • Atypical pneumonia
  • Bilateral basal pneumonia
  • Bilateral pneumonia
  • Chronic pneumonia
  • Community acquired pneumonia
  • Drug induced pneumonitis
  • Fungal pneumonia
  • Healthcare associated pneumonia
  • Nosocomial pneumonia
  • Pneumonia
  • Pneumonia after surgery
  • Pneumonia due to fungus
  • Pneumonia, atypical
  • Pneumonitis
  • Post obstructive pneumonia
  • Postobstructive pneumonia
  • Postoperative pneumonia
  • Recurrent pneumonia
Clinical Information
  • (noo-mone-ya) an inflammatory infection that occurs in the lung.
  • A disorder characterized by inflammation focally or diffusely affecting the lung parenchyma.
  • A severe inflammation of the lungs in which the alveoli (tiny air sacs) are filled with fluid. This may cause a decrease in the amount of oxygen that blood can absorb from air breathed into the lung. Pneumonia is usually caused by infection but may also be caused by radiation therapy, allergy, or irritation of lung tissue by inhaled substances. It may involve part or all of the lungs.
  • An acute, acute and chronic, or chronic inflammation focally or diffusely affecting the lung parenchyma, due to infections (viruses, fungi, mycoplasma, or bacteria), treatment (e.g. Radiation), or exposure (inhalation) to chemicals. Symptoms include cough, shortness of breath, fevers, chills, chest pain, headache, sweating, and weakness.
  • Inflammation of any part, segment or lobe, of the lung parenchyma.
  • Inflammation of the lungs with consolidation and exudation.
  • Pneumonia is an inflammation of the lung, usually caused by an infection. Three common causes are bacteria, viruses and fungi. You can also get pneumonia by accidentally 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. If you have pneumonia, you may have difficulty breathing and have a cough and a fever. A physical exam and history can help determine if you have pneumonia. Chest x-rays and blood tests can help determine what is wrong. Treatment depends on what made you sick. If bacteria are the cause, antibiotics should help. Viral pneumonia may get better with rest and drinking liquids.preventing pneumonia is always better than treating it. The best preventive measures include washing your hands frequently, not smoking, and wearing a mask when cleaning dusty or moldy areas. There is a vaccine for pneumococcal pneumonia, a bacterial infection which accounts for up to a quarter of all pneumonias.
ICD-10-CM J18.9 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 193 Simple pneumonia and pleurisy with mcc
  • 194 Simple pneumonia and pleurisy with cc
  • 195 Simple pneumonia and pleurisy without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems
  • 974 Hiv with major related condition with mcc
  • 975 Hiv with major related condition with cc
  • 976 Hiv with major related condition without cc/mcc

Convert J18.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
Code annotations containing back-references to J18.9:
  • Type 1 Excludes: J16
    ICD-10-CM Diagnosis Code J16

    Pneumonia due to other infectious organisms, not elsewhere classified

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Code First
    Code Also
    • associated abscess, if applicable (J85.1)
    Type 1 Excludes
    • congenital pneumonia (P23.-)
    • ornithosis (A70)
    • pneumocystosis (B59)
    • pneumonia NOS (J18.9)

Diagnosis Index entries containing back-references to J18.9:
  • Infection, infected, infective (opportunistic) B99.9
    ICD-10-CM Diagnosis Code B99.9

    Unspecified infectious disease

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) J18.9
    • atypical NEC J18.9

ICD-10-CM Codes Adjacent To J18.9
J15.9 Unspecified bacterial pneumonia
J16 Pneumonia due to other infectious organisms, not elsewhere classified
J16.0 Chlamydial pneumonia
J16.8 Pneumonia due to other specified infectious organisms
J17 Pneumonia in diseases classified elsewhere
J18 Pneumonia, unspecified organism
J18.0 Bronchopneumonia, unspecified organism
J18.1 Lobar pneumonia, unspecified organism
J18.2 Hypostatic pneumonia, unspecified organism
J18.8 Other pneumonia, unspecified organism
J18.9 Pneumonia, unspecified organism
J20 Acute bronchitis
J20.0 Acute bronchitis due to Mycoplasma pneumoniae
J20.1 Acute bronchitis due to Hemophilus influenzae
J20.2 Acute bronchitis due to streptococcus
J20.3 Acute bronchitis due to coxsackievirus
J20.4 Acute bronchitis due to parainfluenza virus
J20.5 Acute bronchitis due to respiratory syncytial virus
J20.6 Acute bronchitis due to rhinovirus
J20.7 Acute bronchitis due to echovirus
J20.8 Acute bronchitis due to other specified organisms

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.