J18.9
BillablePneumonia, unspecified organism
Pneumonia, unspecified organism
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •smoke inhalationT59.81
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •allergic or eosinophilic pneumoniaJ82
- •aspiration pneumonia NOSJ69.0
- •meconium pneumoniaP24.01
- •neonatal aspiration pneumoniaP24
- •pneumonia due to solids and liquidsJ69
- •congenital pneumoniaP23.9
- •lipid pneumoniaJ69.1
- •rheumatic pneumoniaI00
- •ventilator associated pneumoniaJ95.851
- •abscess of lung with pneumoniaJ85.1
- •aspiration pneumonia due to anesthesia during labor and deliveryO74.0
- •aspiration pneumonia due to anesthesia during pregnancyO29
- •aspiration pneumonia due to anesthesia during puerperiumO89.0
- •aspiration pneumonia due to solids and liquidsJ69
- •pneumonitis due to external agentsJ67-J70
Code First
The underlying condition must be sequenced before this code
Use Additional Code
Additional codes that should follow this code
- code, where applicable, to identify:
- •exposure to environmental tobacco smokeZ77.22
- •exposure to tobacco smoke in the perinatal periodP96.81
- •history of tobacco dependenceZ87.891
- •occupational exposure to environmental tobacco smokeZ57.31
- •tobacco dependenceF17
- •tobacco useZ72.0
- •code, if applicable, to identify resistance to antimicrobial drugsZ16
Code Also
A second code may be required; sequencing depends on circumstances
- , if applicable, any associated condition such as:
- •aspiration pneumoniaJ69
Related Codes(4)
Related Conditions
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
See This Code in Action
Extracted Entities
Free to start. No credit card required.
Also Known As / Clinical Terms(95)
SNOMED CT
- Unresolved pneumonia57702005
- Foreign body pneumonia65141002
- Acute gastroenteritis69776003
- Chlamydia psittaci infection75116005
- Ornithosis75116005
- Parrot fever75116005
- Parrot fever due to Chlamydia psitacci75116005
- Psittacosis75116005
- Parapneumonic effusion81075000
- Pleural effusion associated with pulmonary infection81075000
- Louisiana pneumonia81164001
- Ornithosis with pneumonia81164001
- Acute ulcerative gastroenteritis complicating pneumonia109814008
- Infectious disease of lung128601007
- Lung infection128601007
- Pulmonary infection128601007
- Pneumonitis205237003
- Pneumonia233604007
- Atypical pneumonia233606009
- Chlamydial pneumonia233609002
- Pneumonia caused by Chlamydiaceae233609002
- Haemorrhagic pneumonia233617005
- Hemorrhagic pneumonia233617005
- Postoperative pneumonia314978007
- CAP - community acquired pneumonia385093006
- Community acquired pneumonia385093006
- Bilateral pneumonia407671000
- Pneumonia with AIDS (acquired immunodeficiency syndrome)421671002
- Pneumonia with acquired immunodeficiency syndrome421671002
- Respiratory disorder with AIDS (acquired immunodeficiency syndrome)421874007
- Respiratory disorder with acquired immunodeficiency syndrome421874007
- HAP - hospital acquired pneumonia425464007
- Hospital acquired pneumonia425464007
- Nosocomial pneumonia425464007
- Acute erosive gastritis444926003
- Postoperative lower respiratory tract infection448719004
- Recurrent lower respiratory tract infection448739000
- Recurrent pneumonia699014000
- Disorder of respiratory system co-occurrent with human immunodeficiency virus infection713484001
- Pneumonitis due to foreign body1306603001
- Chronic pneumonia102361000119104
- Erosive gastritis1086791000119100
UMLS
Clinical Terms
- organism pneumonia
- organisms pneumonia
- Lung infection
- pneumonia organism nos
- Postoperative lower respiratory tract infection
- Hemorrhagic pneumonia
- CAP - community acquired pneumonia
- Louisiana pneumonia
- Pneumonia with AIDS (acquired immunodeficiency syndrome)
- Pneumonitis due to foreign body
- Pneumonitis
- Pneumonia, organism unspecified
- Community acquired pneumonia
- Hospital acquired pneumonia
- Nosocomial pneumonia
- Respiratory disorder with acquired immunodeficiency syndrome
- Foreign body pneumonia
- Parrot fever due to Chlamydia psitacci
- Atypical pneumonia
- Parrot fever
- Infectious disease of lung
- Unresolved pneumonia
- Pneumonia
- Haemorrhagic pneumonia
- Parapneumonic effusion
- Psittacosis
- Postoperative pneumonia
- Recurrent pneumonia
- Pneumonia with acquired immunodeficiency syndrome
- Erosive gastritis
- Chronic pneumonia
- Ornithosis
- Ornithosis with pneumonia
- Disorder of respiratory system co-occurrent with human immunodeficiency virus infection
- Pleural effusion associated with pulmonary infection
- Respiratory disorder with AIDS (acquired immunodeficiency syndrome)
- Bilateral pneumonia
- Pneumonia caused by Chlamydiaceae
- Acute erosive gastritis
- Chlamydia psittaci infection
- Chlamydial pneumonia
- pneumonia organism
- HAP - hospital acquired pneumonia
- Recurrent lower respiratory tract infection
- Pulmonary infection
- Acute gastroenteritis
- Acute ulcerative gastroenteritis complicating pneumonia
Frequently Asked Questions
What is the ICD-10 code for pneumonia, unspecified organism?
The ICD-10-CM code for pneumonia, unspecified organism is J18.9. The full clinical description is "Pneumonia, unspecified organism". J18.9 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code J18.9 mean?
ICD-10-CM code J18.9 represents “Pneumonia, unspecified organism”. It is classified under Chapter 10: Diseases of the Respiratory System and is a billable/specific code that can be used on a claim.
Is J18.9 a billable code?
Yes, J18.9 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is J18.9 in?
J18.9 is in Chapter 10: Diseases of the Respiratory System (codes J00-J99).
What codes cannot be used with J18.9?
J18.9 has Excludes1 notes indicating codes that cannot be used together with it, including: congenital pneumonia (P23.0); drug-induced interstitial lung disorder (J70.2-J70.4); interstitial pneumonia NOS (J84.9); and 3 more.
Are additional codes required with J18.9?
Yes, when using J18.9, also report: 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); code, if applicable, to identify resistance to antimicrobial drugs (Z16.-).
What SNOMED CT codes does J18.9 map to?
J18.9 maps to 27 SNOMED CT concepts: 444926003, 69776003, 109814008, 233606009, 407671000, and 22 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for J18.9?
J18.9 is linked to 1 UMLS Concept Unique Identifier: C0339951. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does J18.9 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like pneumonia, unspecified organism affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of J18.9?
J18.9 maps to the ICD-11 code: CA40.Z (Pneumonia, organism unspecified).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.