J40 — Bronchitis, not specified as acute or chronic

J40

ICD-10 Chapter 10: Respiratory System — illustrative image — Chapter 10: Diseases of the respiratory system (J00–J99) — illustrative image

What this code means

Bronchitis is inflammation of the airways causing cough; this code is used when it is not recorded as acute or chronic.

Also called: bronchitis.

When this code is used

Used for bronchitis, not specified as acute or chronic.

Where it sits in ICD-10-CM

Code J40 belongs to Chapter 10: Diseases of the respiratory system, which covers codes J00–J99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

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Frequently asked questions

What is ICD-10-CM code J40?

J40 is the ICD-10-CM diagnosis code for “Bronchitis, not specified as acute or chronic”. Bronchitis is inflammation of the airways causing cough; this code is used when it is not recorded as acute or chronic.

When is code J40 used?

Used for bronchitis, not specified as acute or chronic. It belongs to Chapter 10 of ICD-10-CM (Diseases of the respiratory system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.