ICD-10 Code J45.90 – Unspecified Asthma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J45.90 – Unspecified asthma
What it is
Use this code for asthma when the record confirms asthma but does not identify a specific type, severity, or trigger. It captures a general asthma diagnosis without further detail.
Clinical signs
Clinical features may include recurrent wheeze, cough, chest tightness, or shortness of breath. Clinical features vary; refer to documentation.
When to use this code
Use J45.90 when the provider documents asthma and no more specific asthma code is supported by the note. It is appropriate when the chart lacks details such as severity, status, or cause. If the documentation later clarifies the asthma type, code the more specific diagnosis instead.
Do not use for
Do not use this code when the record specifies a more detailed asthma diagnosis, such as allergic, exercise-induced, or severe persistent asthma. Check documentation if the note is unclear.
Coding tip
Look for specificity in the assessment, problem list, and discharge summary before defaulting to J45.90.