J15.9 Unspecified bacterial pneumonia

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Pneumonia due to gram-positive bacteria

Applies from J15 Bacterial pneumonia, not elsewhere classified

Includes

• bronchopneumonia due to bacteria other than S. pneumoniae and H. influenzae

Excludes1 (never code together)

• chlamydial pneumonia (J16.0)
• congenital pneumonia (P23.-)
• Legionnaires' disease (A48.1)
• spirochetal pneumonia (A69.8)

Code first

• , if applicable, associated influenza (J09.X1, J10.0-, J11.0-)

Code also

• , if applicable, any associated condition such as:
• abscess (J85.1)
• aspiration pneumonia (J69.-)

MS-DRG index

Defines the logic of DRG(s) 193-195 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 482.9 Bacterial pneumonia, unspecified

Code annotations containing back-references to J15.9

Back-references to J15

• Code Also: D81.82 Activated Phosphoinositide 3-kinase Delta Syndrome [APDS] ("pneumonia (J12-J18)")
• Use Additional: J95.89 Other postprocedural complications and disorders of respiratory system, not elsewhere classified ("bacterial or viral pneumonia (J12-J18)")

Diagnosis Index entries for J15.9

• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › aspiration › due to › aspiration of microorganisms › bacterial
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › bacillus
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › bacterial
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › broncho-, bronchial (confluent) (croupous) (diffuse) (disseminated) (hemorrhagic) (involving lobes) (lobar) (terminal) › bacterial
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › lobar (disseminated) (double) (interstitial) › bacterial

Nearby codes

• J15.6 Pneumonia due to other Gram-negative bacteria
• 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 (this code)