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Free Medical Coding > ICD10 CM > 2025 ICD-10-CM Codes > 2025 ICD-10-CM Codes J00-J99 – Diseases of the respiratory system (J00-J99) > 2025 ICD-10-CM Codes J09-J18 – Influenza and pneumonia (J09-J18) > 2025 ICD-10-CM Codes J18 – Pneumonia, unspecified organism (J18) > 2025 ICD-10-CM Diagnosis Code J18.9 – Pneumonia, unspecified organism (J18.9)

2025 ICD-10-CM Diagnosis Code J18.9 – Pneumonia, unspecified organism (J18.9)

2016201720182019202020212022202320242025Billable/Specific Code
  • J18.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM J18.9 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of J18.9 – other international versions of ICD-10 J18.9 may differ.

ICD-10-CM J18.9 is grouped within Diagnostic Related Group(s):

  • 193 Simple pneumonia and pleurisy with mcc
  • 194 Simple pneumonia and pleurisy with cc
  • 195 Simple pneumonia and pleurisy without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems
  • 974 Hiv with major related condition with mcc
  • 975 Hiv with major related condition with cc
  • 976 Hiv with major related condition without cc/mcc

Code History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2016 (effective 10/1/2015): No change
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to J18.9:

  • lung > Infection, infected, infective (opportunistic) B99.9
  • atypical NEC > Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) J18.9

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