ICD-10-CM 2027
ICD-10 code for pneumonia
Confirmed by the official ICD-10-CM index entry “pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)”. Page updated September 29, 2026.
About coding pneumonia
The ICD-10-CM code for pneumonia is J18.9 (Pneumonia, unspecified organism). The official index lists 26 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J18.9.
Within J18, choose J18.9 (Pneumonia, unspecified organism) only when documentation doesn't support a more specific option: Bronchopneumonia, unspecified organism (J18.0), Lobar pneumonia, unspecified organism (J18.1), Hypostatic pneumonia, unspecified organism (J18.2) and other pneumonia, unspecified organism (J18.8).
Code first: , if applicable, associated influenza (J09.X1, J10.0-, J11.0-).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
Related Pneumonia codes
- J12.0 Adenoviral pneumonia
- J12.1 Respiratory syncytial virus pneumonia
- J12.2 Parainfluenza virus pneumonia
- J12.3 Human metapneumovirus pneumonia
- J12.81 Pneumonia due to SARS-associated coronavirus
- J12.82 Pneumonia due to coronavirus disease 2019
- J12.89 Other viral pneumonia
- J12.9 Viral pneumonia, unspecified
- J15.0 Pneumonia due to Klebsiella pneumoniae
- J15.1 Pneumonia due to Pseudomonas
- J15.20 Pneumonia due to staphylococcus, unspecified
- J15.211 Pneumonia due to Methicillin susceptible Staphylococcus aureus
- J15.212 Pneumonia due to Methicillin resistant Staphylococcus aureus
- J15.29 Pneumonia due to other staphylococcus
- J15.3 Pneumonia due to streptococcus, group B
- J15.4 Pneumonia due to other streptococci
- J15.5 Pneumonia due to Escherichia coli
- J15.61 Pneumonia due to Acinetobacter baumannii
- J15.69 Pneumonia due to other Gram-negative bacteria
- J15.7 Pneumonia due to Mycoplasma pneumoniae
- J15.8 Pneumonia due to other specified bacteria
- J15.9 Unspecified bacterial pneumonia
- J18.0 Bronchopneumonia, unspecified organism
- J18.1 Lobar pneumonia, unspecified organism
- J18.2 Hypostatic pneumonia, unspecified organism
- J18.8 Other pneumonia, unspecified organism
Common questions about pneumonia ICD-10 codes
What is the ICD-10 code for pneumonia?
- J18.9 — Pneumonia, unspecified organism. More specific codes apply when the documentation supports them: J12.0, J12.1, J12.2, J12.3 and others below.
What is the ICD-10 code for adenoviral pneumonia?
- J12.0 — Adenoviral pneumonia.
What is the ICD-10 code for respiratory syncytial virus pneumonia?
- J12.1 — Respiratory syncytial virus pneumonia.
What is the ICD-10 code for parainfluenza virus pneumonia?
- J12.2 — Parainfluenza virus pneumonia.
What is the ICD-10 code for human metapneumovirus pneumonia?
- J12.3 — Human metapneumovirus pneumonia.
What is the ICD-10 code for pneumonia due to sars-associated coronavirus?
- J12.81 — Pneumonia due to SARS-associated coronavirus.
What is the ICD-10 code for pneumonia due to coronavirus disease 2019?
- J12.82 — Pneumonia due to coronavirus disease 2019.
Is J18.9 billable?
- Yes. J18.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J18.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J18.9 as a principal diagnosis.
Is J18.9 a CC or MCC?
- J18.9 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.