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  3. J00–J99
  4. Chronic lower respiratory diseases (J40-J4A)

Chronic lower respiratory diseases (J40-J4A)

ICD-10 codes J40-J4A cover chronic lower respiratory diseases, including various forms of bronchitis, emphysema, chronic obstructive pulmonary disease (COPD), asthma, bronchiectasis, and chronic lung allograft dysfunction. These codes are used to classify persistent lung conditions affecting breathing over time.

This range begins with J40, describing unspecified bronchitis, which includes terms like tracheobronchitis and occupational bronchitis. It progresses through chronic bronchitis forms, such as simple (J41.0) and mucopurulent chronic bronchitis (J41.1), also known as smokers' cough or purulent bronchitis. Emphysema types (J43) such as panlobular and centrilobular relate to damaged lung tissue causing airflow obstruction. Codes starting at J44 address other chronic obstructive pulmonary diseases, including acute exacerbations and forms like bronchiolitis obliterans. Asthma codes (J45) specify severity and control level, covering mild intermittent to severe persistent asthma, including variants like exercise-induced bronchospasm (J45.990) and cough variant asthma (J45.991). Bronchiectasis (J47) codes cover dilated, damaged bronchi, with or without infection. Finally, J4A describes chronic lung allograft dysfunction, complications affecting lung transplant patients. These codes help healthcare providers accurately document and manage chronic respiratory illnesses.

Instructional Notations

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • bronchitis due to chemicals, gases, fumes and vapors J68.0

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • cystic fibrosis E84