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J45.909 — Unspecified asthma, uncomplicated
J45.909
What this code means
Asthma is a long-term condition in which the airways narrow and swell, causing wheezing, cough and breathlessness.
Also called: asthma.
When this code is used
Used for asthma when severity is not specified, uncomplicated.
Where it sits in ICD-10-CM
Code J45.909 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.
Learn more about this condition
Related symptoms
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code J45.909?
J45.909 is the ICD-10-CM diagnosis code for “Unspecified asthma, uncomplicated”. Asthma is a long-term condition in which the airways narrow and swell, causing wheezing, cough and breathlessness.
When is code J45.909 used?
Used for asthma when severity is not specified, uncomplicated. 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.