Asthma ICD-10-CM Codes
ICD-10-CM codes for asthma classified by severity, including mild intermittent, mild persistent, moderate persistent, and severe persistent asthma.
Coding Guidance for Asthma
Asthma codes in category J45 are built on documented severity: mild intermittent (J45.2x), mild persistent (J45.3x), moderate persistent (J45.4x), and severe persistent (J45.5x). J45.909 (unspecified, uncomplicated) applies when severity is not documented.
The final character distinguishes uncomplicated asthma from asthma with acute exacerbation and asthma with status asthmaticus. Status asthmaticus is a life-threatening failure to respond to treatment and takes precedence over exacerbation when both are documented.
Query the provider for severity when it is missing: unspecified codes are a frequent target of payer reviews for this condition.
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About these codes
These ICD-10-CM codes are sourced from the official FY2026 tabular list published by the Centers for Medicare & Medicaid Services (CMS), effective April 1, 2026. Click any code for full clinical details including instructional notes, excludes guidance, and DRG mappings.
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