Eosinophilia in diseases classified elsewhere

This code indicates an elevated eosinophil count in the blood or tissues that is a manifestation of an underlying disease process. It signifies secondary eosinophilia, where the increase in eosinophils is not the primary diagnosis but rather a symptom or complication of another condition.

Use this code when documentation clearly links eosinophilia to a specific, separately classified disease, such as parasitic infections, allergic reactions, certain autoimmune disorders, or drug reactions. The primary diagnosis for the underlying condition should be coded first, followed by this code to specify the associated eosinophilia.

• Always sequence the underlying disease first, as this code is for a manifestation.
• Do not use this code for idiopathic or primary eosinophilia; refer to D72.11 for those cases.
• Ensure the medical record explicitly states the connection between the eosinophilia and the "classified elsewhere" disease.