2026 ICD-10-CM Diagnosis Code J13Pneumonia due to Streptococcus pneumoniae
ICD-10-CM Codes›J00–J99›J09-J18›J13
- Billable — Valid for Submission
- Not Chronic
J13 is a billable ICD-10-CM diagnosis code for pneumonia due to Streptococcus pneumoniae. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 193 through 195, 974 through 976. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Pneumonia (except that caused by tuberculosis).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bacterial pneumonia co-occurrent with human immunodeficiency virus infection
- Bacterial pneumonia with AIDS
- Bronchopneumonia caused by Streptococcus
- Bronchopneumonia caused by Streptococcus pneumoniae
- Disorder of respiratory system co-occurrent with human immunodeficiency virus infection
- Lobar pneumonia
- Pneumococcal bronchitis
- Pneumococcal lobar pneumonia
- Pneumococcal pneumonia
- Pneumococcal pneumonia with AIDS
- Pneumonia with AIDS
- Respiratory disorder with AIDS
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Bronchopneumonia due to S. pneumoniae
Code First
Code Also
Type 1 Excludes
- congenital pneumonia due to S. pneumoniae P23.6
- lobar pneumonia, unspecified organism J18.1
- pneumonia due to other streptococci J15.3 J15.4
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Embolism (multiple) (paradoxical) - I74.9
- pyemic (multiple) - I76
- pneumococcal - A40.3
- with pneumonia - J13
- Infection, infected, infective (opportunistic) - B99.9
- pneumococcus, pneumococcal NEC - A49.1
- generalized (purulent) - A40.3
- with pneumonia - J13
- Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) - J18.9
- broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal) - J18.0
- diplococcal - J13
- pneumococcal - J13
- pneumoniae - J13
- Diplococcus (pneumoniae) - J13
- pneumococcus - J13
- Streptococcus - J15.4
- pneumoniae - J13
- lobar (disseminated) (double) (interstitial) - J18.1
- pneumococcal - J13
- Streptococcus pneumoniae - J13
- pneumococcal (broncho) (lobar) - J13
- Streptococcus pneumoniae - J13
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Embolism(multiple) (paradoxical)
- pyemic (multiple)
- pneumococcal
- with pneumonia
- Infection, infected, infective(opportunistic)
- pneumococcus, pneumococcal NEC
- generalized (purulent)
- with pneumonia
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal)
- diplococcal
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal)
- pneumococcal
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal)
- streptococcal NEC
- pneumoniae
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- diplococcal, diplococcus (broncho-) (lobar)
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- in (due to)
- Diplococcus (pneumoniae)
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- in (due to)
- pneumococcus
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- in (due to)
- Streptococcus
- pneumoniae
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- lobar (disseminated) (double) (interstitial)
- pneumococcal
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- lobar (disseminated) (double) (interstitial)
- Streptococcus pneumoniae
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- pneumococcal (broncho) (lobar)
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- Streptococcus pneumoniae
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Pneumococcal Pneumonia
pneumonia that is attributed to the bacteria streptococcus pneumonia.
Patient EducationClinical
Pneumococcal Infections
Pneumococci are a type of streptococcus bacteria. The bacteria spread through contact with people who are ill or by healthy people who carry the bacteria in the back of their nose. Pneumococcal infections can be mild or severe. The most common types of infections are:
Read the full article at MedlinePlus
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Convert J13 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J13Overview
Is J13 (Pneumonia due to Streptococcus pneumoniae) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pneumonia due to Streptococcus pneumoniae on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J13 group to?
When pneumonia due to Streptococcus pneumoniae is the principal diagnosis on an inpatient stay, it groups to MS-DRG 193, 194, 195, 974, 975, 976, with relative weights from 0.6285 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of J13?
Under the General Equivalence Mappings, pneumonia due to Streptococcus pneumoniae converts to ICD-9-CM 481 (pneumococcal pneumonia). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
