J18.9
ICD-10BillablePneumonia, unspecified organism
Official ICD-10-CM descriptor (FY2026)
Pneumonia, unspecified organism
J18.9 is valid for submission on a claim — CMS flags it as a billable, specific code.
Plain-language explanation
Pneumonia where the record does not identify the causative organism. Pneumonia with an identified organism is classified in the J13–J16 categories instead.
Written by Krasyn as a general orientation to the code. It is not from CMS and is not clinical or coding advice.
Related codes in J18
Where this code sits
- Parent code
- J18
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.