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J45.901 — Unspecified asthma with (acute) exacerbation
J45.901
What this code means
An asthma attack (exacerbation): a sudden worsening of asthma with wheezing, cough and breathlessness, in unspecified asthma.
Also called: asthma exacerbation, asthma attack.
When this code is used
Used for unspecified asthma with (acute) exacerbation.
Where it sits in ICD-10-CM
Code J45.901 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
Frequently asked questions
What is ICD-10-CM code J45.901?
J45.901 is the ICD-10-CM diagnosis code for “Unspecified asthma with (acute) exacerbation”. An asthma attack (exacerbation): a sudden worsening of asthma with wheezing, cough and breathlessness, in unspecified asthma.
When is code J45.901 used?
Used for unspecified asthma with (acute) exacerbation. 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.