J18Header code — not billable

Pneumonia, unspecified organism

Chapter
10. Diseases of the respiratory system
Category
J18
Effective date
October 1, 2026

Related codes in category J18

J18.0Bronchopneumonia, unspecified organismYesJ18.1Lobar pneumonia, unspecified organismYesJ18.2Hypostatic pneumonia, unspecified organismYesJ18.8Other pneumonia, unspecified organismYesJ18.9Pneumonia, unspecified organismYes

Frequently asked questions

What is ICD-10 code J18?

J18 is an ICD-10-CM diagnosis code for Pneumonia, unspecified organism.

Is J18 a billable code?

No. J18 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is J18 in?

J18 falls under Chapter 10: Diseases of the respiratory system.

When did J18 become effective?

J18 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to J18?

J18 belongs to category J18, which includes 5 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.