J18.1
BillableLobar pneumonia, unspecified organism
Lobar 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
Also Known As / Clinical Terms(67)
SNOMED CT
- Unresolved pneumonia57702005
- Unresolved lobar pneumonia66429007
- Lung consolidation95436008
- Lobar pneumonia278516003
- Basal pneumonia300999006
- Lower lobe pneumonia300999006
- LLL - Left lower lobe pneumonia301000005
- LLZ - Left lower zone pneumonia301000005
- Left basal pneumonia301000005
- Left lower lobe pneumonia301000005
- Left lower zone pneumonia301000005
- Lobar pneumonia left lower lobe301000005
- Lobar pneumonia right lower lobe301001009
- RLL - Right lower lobe pneumonia301001009
- RLZ - Right lower zone pneumonia301001009
- Right basal pneumonia301001009
- Right lower lobe pneumonia301001009
- Right lower zone pneumonia301001009
- LUZ - Left upper zone pneumonia301002002
- Left upper lobe pneumonia301002002
- Left upper zone pneumonia301002002
- Lobar pneumonia left upper lobe301002002
- Lobar pneumonia right middle lobe301003007
- RMZ - Right middle zone pneumonia301003007
- Right middle lobe pneumonia301003007
- Right middle zone pneumonia301003007
- Lobar pneumonia right upper lobe301004001
- RUL (right upper lobe) pneumonia301004001
- RUZ (right upper zone) pneumonia301004001
- Right upper lobe pneumonia301004001
- Right upper zone pneumonia301004001
- Lingular pneumonia426696003
- Consolidation of lung present846749001
Clinical Terms
- Lobar pneumonia
- LLL - Left lower lobe pneumonia
- Lobar pneumonia left upper lobe
- Lung consolidation
- Right lower lobe pneumonia
- LLZ - Left lower zone pneumonia
- RMZ - Right middle zone pneumonia
- LUZ - Left upper zone pneumonia
- Left lower zone pneumonia
- Lower lobe pneumonia
- Right upper lobe pneumonia
- Unresolved lobar pneumonia
- Left basal pneumonia
- Left upper lobe pneumonia
- Right middle zone pneumonia
- Lobar pneumonia right middle lobe
- Left lower lobe pneumonia
- Right middle lobe pneumonia
- Right basal pneumonia
- Right lower zone pneumonia
- Lobar pneumonia right lower lobe
- Unresolved pneumonia
- Right upper zone pneumonia
- Basal pneumonia
- Left upper zone pneumonia
- Lobar pneumonia right upper lobe
- Lobar pneumonia left lower lobe
- Lingular pneumonia
- RLZ - Right lower zone pneumonia
- RLL - Right lower lobe pneumonia
- Consolidation of lung present
- RUZ (right upper zone) pneumonia
- RUL (right upper lobe) pneumonia
Frequently Asked Questions
What is the ICD-10 code for lobar pneumonia, unspecified organism?
The ICD-10-CM code for lobar pneumonia, unspecified organism is J18.1. The full clinical description is "Lobar pneumonia, unspecified organism". J18.1 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code J18.1 mean?
ICD-10-CM code J18.1 represents “Lobar 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 J18.1 a billable code?
Yes, J18.1 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is J18.1 in?
J18.1 is in Chapter 10: Diseases of the Respiratory System (codes J00-J99).
What codes cannot be used with J18.1?
J18.1 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 J18.1?
Yes, when using J18.1, 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 J18.1 map to?
J18.1 maps to 12 SNOMED CT concepts: 300999006, 846749001, 301000005, 301002002, 426696003, and 7 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for J18.1?
J18.1 is linked to 1 UMLS Concept Unique Identifier: C0339966. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does J18.1 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like lobar 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 J18.1?
J18.1 maps to the ICD-11 code: CA40.Z (Pneumonia, organism unspecified).
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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.