ICD-10 Code J45.9 – Other and unspecified asthma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J45.9 – Other and unspecified asthma
What it is
J45.9 identifies asthma when the record does not specify a subtype or when the provider documents asthma without further detail. Use it for nonspecific asthma diagnoses that still require coding.
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 J45.9 when the provider documents “asthma” or “unspecified asthma” and no more specific type is stated. It also fits cases where the chart lacks enough detail to assign a more precise asthma code. If the record later identifies a specific asthma category, code that instead.
Do not use for
Do not use J45.9 when the provider documents a specific asthma type, such as allergic, exercise-induced, or cough-variant asthma. Check documentation if another respiratory condition better explains the visit.
Coding tip
Query the provider when asthma is mentioned but the subtype or severity is unclear, so you can code the most specific documented diagnosis.