ICD-10 Code for Pneumonia

The default ICD-10-CM 2027 code for pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) is J18.9 – Pneumonia, unspecified organism. More specific codes depend on the details documented, as listed in the official index (104 codes, 102 billable).

Main code: J18.9 – Pneumonia, unspecified organism
Billable: Yes

Index entries for Pneumonia

with
- lung abscess – J85.1
  - due to specified organism – see Pneumonia, in (due to)
- influenza – see Influenza, with, pneumonia
2019 (novel) – J12.82
adenoviral – J12.0
adynamic – J18.2
alba – A50.04
allergic – J82.89 – see also Pneumonitis, hypersensitivity
alveolar – see Pneumonia, lobar
anaerobes – J15.8
anthrax – A22.1
apex, apical – see Pneumonia, lobar
Ascaris – B77.81
aspiration – J69.0
- due to
  - aspiration of microorganisms
    - bacterial – J15.9
    - viral – J12.9
  - food (regurgitated) – J69.0
  - gastric secretions – J69.0
  - milk (regurgitated) – J69.0
  - oils, essences – J69.1
  - solids, liquids NEC – J69.8
  - vomitus – J69.0
- newborn – P24.81
  - amniotic fluid (clear) – P24.11
  - blood – P24.21
  - liquor (amnii) – P24.11
  - meconium – P24.01
  - milk – P24.31
  - mucus – P24.11
  - food (regurgitated) – P24.31
  - specified NEC – P24.81
  - stomach contents – P24.31
- postprocedural – J95.4
atypical NEC – J18.9
bacillus – J15.9
- specified NEC – J15.8
bacterial – J15.9
- specified NEC – J15.8
Bacteroides (fragilis) (oralis) (melaninogenicus) – J15.8
basal, basic, basilar – see Pneumonia, by type
bronchiolitis obliterans organized (BOOP) – J84.89
broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal) – J18.0
- allergic – J82.89 – see also Pneumonitis, hypersensitivity
- aspiration – see Pneumonia, aspiration
- bacterial – J15.9
  - specified NEC – J15.8
- chronic – see Fibrosis, lung
- diplococcal – J13
- Eaton's agent – J15.7
- Escherichia coli (E. coli) – J15.5
- Friedländer's bacillus – J15.0
- Hemophilus influenzae – J14
- hypostatic – J18.2
- inhalation – see also Pneumonia, aspiration
  - due to fumes or vapors (chemical) – J68.0
  - of oils or essences – J69.1
- Klebsiella (pneumoniae) – J15.0
- lipid, lipoid – J69.1
  - endogenous – J84.89
- Mycoplasma (pneumoniae) – J15.7
- pleuro-pneumonia-like-organisms (PPLO) – J15.7
- pneumococcal – J13
- Proteus – J15.69
- Pseudomonas – J15.1
- Serratia marcescens – J15.69
- specified organism NEC – J16.8
- staphylococcal – see Pneumonia, staphylococcal
- streptococcal NEC – J15.4
  - group B – J15.3
  - pneumoniae – J13
- viral, virus – see Pneumonia, viral
Butyrivibrio (fibriosolvens) – J15.8
Candida – B37.1
caseous – see Tuberculosis, pulmonary
catarrhal – see Pneumonia, broncho
chlamydial – J16.0
- congenital – P23.1
cholesterol – J84.89
cirrhotic (chronic) – see Fibrosis, lung
Clostridium (haemolyticum) (novyi) – J15.8
confluent – see Pneumonia, broncho
congenital (infective) – P23.9
- due to
  - bacterium NEC – P23.6
  - Chlamydia – P23.1
  - Escherichia coli – P23.4
  - Haemophilus influenzae – P23.6
  - infective organism NEC – P23.8
  - Klebsiella pneumoniae – P23.6
  - Mycoplasma – P23.6
  - Pseudomonas – P23.5
  - Staphylococcus – P23.2
  - Streptococcus (except group B) – P23.6
    - group B – P23.3
  - viral agent – P23.0
- specified NEC – P23.8
coronavirus (novel) (disease) – J12.82
COVID-19 – J12.82
croupous – see Pneumonia, lobar
cryptogenic organizing – J84.116
cytomegalic inclusion – B25.0
cytomegaloviral – B25.0
deglutition – see Pneumonia, aspiration
desquamative interstitial – J84.117
diffuse – see Pneumonia, broncho
diplococcal, diplococcus (broncho-) (lobar) – J13
disseminated (focal) – see Pneumonia, broncho
Eaton's agent – J15.7
embolic, embolism – see Embolism, pulmonary
Enterobacter – J15.69
eosinophilic – J82.81
- acute – J82.82
- chronic – J82.81
Escherichia coli (E. coli) – J15.5
Eubacterium – J15.8
fibrinous – see Pneumonia, lobar
fibroid, fibrous (chronic) – see Fibrosis, lung
Friedländer's bacillus – J15.0
Fusobacterium (nucleatum) – J15.8
gangrenous – J85.0
giant cell (measles) – B05.2
gonococcal – A54.84
gram-negative bacteria NEC – J15.69
- anaerobic – J15.8
Hemophilus influenzae (broncho) (lobar) – J14
human metapneumovirus – J12.3
hypostatic (broncho) (lobar) – J18.2
in (due to)
- Acinetobacter baumannii – J15.61
- actinomycosis – A42.0
- adenovirus – J12.0
- anthrax – A22.1
- ascariasis – B77.81
- aspergillosis – B44.9
- Bacillus anthracis – A22.1
- Bacterium anitratum – J15.69
- candidiasis – B37.1
- chickenpox – B01.2
- Chlamydia – J16.0
  - neonatal – P23.1
- coccidioidomycosis – B38.2
  - acute – B38.0
  - chronic – B38.1
- cytomegalovirus disease – B25.0
- Diplococcus (pneumoniae) – J13
- Eaton's agent – J15.7
- Enterobacter – J15.69
- Escherichia coli (E. coli) – J15.5
- Friedländer's bacillus – J15.0
- fumes and vapors (chemical) (inhalation) – J68.0
- gonorrhea – A54.84
- Hemophilus influenzae (H. influenzae) – J14
- Herellea – J15.69
- histoplasmosis – B39.2
  - acute – B39.0
  - chronic – B39.1
- human metapneumovirus – J12.3
- Klebsiella (pneumoniae) – J15.0
- measles – B05.2
- Mycoplasma (pneumoniae) – J15.7
- nocardiosis, nocardiasis – A43.0
- ornithosis – A70
- parainfluenza virus – J12.2
- pleuro-pneumonia-like-organism (PPLO) – J15.7
- pneumococcus – J13
- pneumocystosis (Pneumocystis carinii) (Pneumocystis jirovecii) – B59
- Proteus – J15.69
- Pseudomonas NEC – J15.1
  - pseudomallei – A24.1
- psittacosis – A70
- Q fever – A78
- respiratory syncytial virus (RSV) – J12.1
- rheumatic fever – I00 – J17 [manifestation]
- rubella – B06.81
- Salmonella (infection) – A02.22
  - typhi – A01.03
- schistosomiasis – B65.9 – J17 [manifestation]
- Serratia marcescens – J15.69
- specified
  - bacterium NEC – J15.8
  - organism NEC – J16.8
- spirochetal NEC – A69.8
- Staphylococcus – J15.20
  - aureus (methicillin susceptible) (MSSA) – J15.211
    - methicillin resistant (MRSA) – J15.212
  - specified NEC – J15.29
- Streptococcus – J15.4
  - group B – J15.3
  - pneumoniae – J13
  - specified NEC – J15.4
- toxoplasmosis – B58.3
- tularemia – A21.2
- typhoid (fever) – A01.03
- varicella – B01.2
- virus – see Pneumonia, viral
- whooping cough – A37.91
  - due to
    - Bordetella parapertussis – A37.11
    - Bordetella pertussis – A37.01
    - specified NEC – A37.81
- Yersinia pestis – A20.2
inhalation of food or vomit – see Pneumonia, aspiration
interstitial – J84.9
- chronic – J84.111
- desquamative – J84.117
- due to
  - collagen vascular disease – J84.178
  - known underlying cause – J84.178
- idiopathic NOS – J84.111
- in disease classified elsewhere – J84.178
- lymphocytic (due to collagen vascular disease) (in diseases classified elsewhere) – J84.178
- lymphoid – J84.2
- non-specific – J84.89
  - due to
    - collagen vascular disease – J84.178
    - known underlying cause – J84.178
  - idiopathic – J84.113
  - in diseases classified elsewhere – J84.178
- plasma cell – B59
- pseudomonas – J15.1
- usual – J84.112
  - due to collagen vascular disease – J84.178
  - idiopathic – J84.112
  - in diseases classified elsewhere – J84.178
Klebsiella (pneumoniae) – J15.0
lipid, lipoid (exogenous) – J69.1
- endogenous – J84.89
lobar (disseminated) (double) (interstitial) – J18.1
- bacterial – J15.9
  - specified NEC – J15.8
- chronic – see Fibrosis, lung
- Escherichia coli (E. coli) – J15.5
- Friedländer's bacillus – J15.0
- Hemophilus influenzae – J14
- hypostatic – J18.2
- Klebsiella (pneumoniae) – J15.0
- pneumococcal – J13
- Proteus – J15.69
- Pseudomonas – J15.1
- specified organism NEC – J16.8
- staphylococcal – see Pneumonia, staphylococcal
- streptococcal NEC – J15.4
- Streptococcus pneumoniae – J13
- viral, virus – see Pneumonia, viral
lobular – see Pneumonia, broncho
Löffler's – J82.89
lymphoid interstitial – J84.2
massive – see Pneumonia, lobar
meconium – P24.01
MRSA (Methicillin resistant Staphylococcus aureus) – J15.212
MSSA (methicillin susceptible Staphylococcus aureus) – J15.211
multilobar – see Pneumonia, by type
Mycoplasma (pneumoniae) – J15.7
necrotic – J85.0
neonatal – P23.9
- aspiration – see Aspiration, by substance, with pneumonia
nitrogen dioxide – J68.0
organizing – J84.89
- due to
  - collagen vascular disease – J84.178
  - known underlying cause – J84.178
- in diseases classified elsewhere – J84.178
orthostatic – J18.2
parainfluenza virus – J12.2
parenchymatous – see Fibrosis, lung
passive – J18.2
patchy – see Pneumonia, broncho
Peptococcus – J15.8
Peptostreptococcus – J15.8
plasma cell (of infants) – B59
pleurolobar – see Pneumonia, lobar
pleuro-pneumonia-like organism (PPLO) – J15.7
pneumococcal (broncho) (lobar) – J13
Pneumocystis (carinii) (jirovecii) – B59
postinfectional NEC – B99 (header) – J17 [manifestation]
postmeasles – B05.2
Proteus – J15.69
Pseudomonas – J15.1
psittacosis – A70
radiation – J70.0
respiratory syncytial virus (RSV) – J12.1
resulting from a procedure – J95.89
rheumatic – I00 – J17 [manifestation]
Salmonella (arizonae) (cholerae-suis) (enteritidis) (typhimurium) – A02.22
- typhi – A01.03
- typhoid fever – A01.03
SARS-associated coronavirus – J12.81
SARS-CoV-2 – J12.82
segmented, segmental – see Pneumonia, broncho-
Serratia marcescens – J15.69
specified NEC – J18.8
- bacterium NEC – J15.8
- organism NEC – J16.8
- virus NEC – J12.89
spirochetal NEC – A69.8
staphylococcal (broncho) (lobar) – J15.20
- aureus (methicillin susceptible) (MSSA) – J15.211
  - methicillin resistant (MRSA) – J15.212
- specified NEC – J15.29
static, stasis – J18.2
streptococcal NEC (broncho) (lobar) – J15.4
- group
  - A – J15.4
  - B – J15.3
  - specified NEC – J15.4
Streptococcus pneumoniae – J13
syphilitic, congenital (early) – A50.04
traumatic (complication) (early) (secondary) – T79.8 (header)
tuberculous (any) – see Tuberculosis, pulmonary
tularemic – A21.2
varicella – B01.2
Veillonella – J15.8
ventilator associated – J95.851
viral, virus (broncho) (interstitial) (lobar) – J12.9
- adenoviral – J12.0
- congenital – P23.0
- human metapneumovirus – J12.3
- parainfluenza – J12.2
- respiratory syncytial (RSV) – J12.1
- SARS-associated coronavirus – J12.81
- specified NEC – J12.89
white (congenital) – A50.04

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.