Other specified allergic alveolitis and pneumonitis

This code signifies inflammatory lung conditions resulting from an allergic reaction to inhaled organic dusts or chemicals, excluding those specifically classified elsewhere. It encompasses a range of hypersensitivity pneumonitides where the causative agent is identified but not listed under more specific ICD-9 codes. The condition involves inflammation of the alveoli and small airways, leading to respiratory symptoms.

Use this code when documentation clearly indicates an allergic alveolitis or pneumonitis due to a specified antigen that does not have its own distinct ICD-9 code. This includes conditions like mushroom worker's lung, suberosis (cork dust), or detergent worker's lung, where the specific allergen is identified in the medical record. Documentation should specify the allergen and the resulting lung inflammation.

• Ensure the documentation specifies the type of allergic alveolitis/pneumonitis and the identified allergen.
• Do not use this code for unspecified allergic alveolitis/pneumonitis; a more general code would be appropriate.
• Differentiate from extrinsic allergic alveolitis with a more specific code if available (e.g., farmer's lung, bird fancier's lung).