ICD-10 Code J45.909 – Unspecified asthma, uncomplicated (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J45.909 – Unspecified asthma, uncomplicated
What it is
J45.909 identifies asthma when the documentation does not specify the asthma type or severity, and no complication is noted. Use it when the record simply states asthma or unspecified asthma.
Clinical signs
Asthma commonly presents with wheezing, shortness of breath, chest tightness, and cough that may vary over time. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents asthma without further detail and does not describe an acute exacerbation or status asthmaticus. It also fits when the chart confirms asthma but leaves severity, type, or complications unspecified. Check documentation before assigning a more specific asthma code.
Do not use for
Do not use J45.909 if the record supports a more specific asthma category, such as allergic, exercise-induced, or cough-variant asthma. Also avoid it when an exacerbation or other complication is documented.
Coding tip
If the note is vague, query for asthma type and severity before defaulting to J45.909.