ICD-10 Code J45.998 – Other asthma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J45.998 – Other asthma
What it is
J45.998 is used for asthma that does not fit a more specific ICD-10 asthma category. It indicates a documented asthma diagnosis, but the record does not identify a more precise type.
Clinical signs
Asthma commonly presents with wheezing, cough, chest tightness, and shortness of breath. Clinical features vary; refer to documentation for the exact asthma pattern or severity noted by the clinician.
When to use this code
Use this code when the provider documents asthma and no other ICD-10 asthma code is supported by the chart. It is appropriate when the note states “other asthma” or when the asthma type is not further specified. Check documentation if the record suggests allergic, exercise-induced, or another defined form.
Do not use for
Do not use J45.998 when the chart supports a more specific asthma code. Do not use it for acute bronchospasm or other respiratory conditions unless asthma is clearly documented.
Coding tip
Code the most specific asthma type documented; if specificity is missing, J45.998 may be the best match.