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Pneumonia, unspecified organism. 2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code. J18.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2022 edition of ICD-10-CM J18.9 became effective on October 1, 2021.