ICD-10 Code D72.18 – Eosinophilia in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D72.18 – Eosinophilia in diseases classified elsewhere
What it is
D72.18 identifies eosinophilia that is caused by another documented disease. Use it when the elevated eosinophils are not the primary diagnosis, but a manifestation of a separate condition.
Clinical signs
Clinical features vary; refer to documentation. You may see an eosinophil increase noted on blood testing, along with signs of the underlying disorder that explains the finding.
When to use this code
Use this code when the record clearly links eosinophilia to another condition, such as a documented secondary cause. Code the underlying disease first when instructed by the record or coding rules, and add D72.18 for the associated eosinophilia.
Do not use for
Do not use D72.18 for eosinophilia without a documented underlying cause. If the chart does not support a secondary condition, check documentation before assigning this code.
Coding tip
Confirm the causal relationship in the note; without that link, you should not assume eosinophilia in diseases classified elsewhere.