J18 (Pneumonia, unspecified organism) is an umbrella ICD-10-CM medical diagnosis code in the Diseases of the respiratory system chapter. It identifies cases of pneumonia, unspecified organism for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

J18 — Pneumonia, unspecified organism

Chapter J00-J99: Diseases of the respiratory system

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Sub-codes under J18

J18.0Bronchopneumonia, unspecified organismJ18.1Lobar pneumonia, unspecified organismJ18.2Hypostatic pneumonia, unspecified organismJ18.8Other pneumonia, unspecified organismJ18.9Pneumonia, unspecified organism

Common questions about J18 (Pneumonia, unspecified organism)

What does ICD-10 code J18 mean?
J18 is the ICD-10-CM 2025 code for Pneumonia, unspecified organism. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is J18 a billable diagnosis code?
J18 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under J18. Browse the sub-codes listed on this page.
Which ICD-10 chapter does J18 belong to?
J18 belongs to the chapter "Diseases of the respiratory system" (codes J00-J99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Pneumonia, unspecified organism?
For a plain-language explanation of Pneumonia, unspecified organism, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Pneumonia, unspecified organism" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗