ICD-10 Code J45.99 – Other asthma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J45.99 – Other asthma
What it is
J45.99 identifies asthma that does not fit a more specific ICD-10 asthma subtype. Use it when the record confirms asthma, but the documentation does not support a more precise category.
Clinical signs
Typical asthma features include episodic wheezing, cough, shortness of breath, and chest tightness. Clinical features vary; refer to documentation.
When to use this code
Use this code when the clinician documents asthma and gives no further qualifying detail, such as type or severity. It also fits cases where the note describes an atypical or unspecified asthma presentation that still clearly meets the diagnosis.
If the chart later supports a more specific asthma code, you should code that more exact option instead. Check documentation for any linked triggers, severity, or status terms that may change code selection.
Do not use for
Do not use J45.99 when the record supports a more specific asthma code, such as allergic, exercise-induced, or cough-variant asthma. Do not use it for wheezing without a documented asthma diagnosis.
Coding tip
Query or review the note for a more specific asthma description before defaulting to J45.99.