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J45.40 — Moderate persistent asthma, uncomplicated
J45.40
What this code means
Moderate persistent asthma: daily symptoms and some limitation of activity, without a current flare.
Also called: moderate persistent asthma.
When this code is used
Used for moderate persistent asthma, uncomplicated.
Where it sits in ICD-10-CM
Code J45.40 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 J45.40?
J45.40 is the ICD-10-CM diagnosis code for “Moderate persistent asthma, uncomplicated”. Moderate persistent asthma: daily symptoms and some limitation of activity, without a current flare.
When is code J45.40 used?
Used for moderate persistent asthma, 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.