Hypereosinophilic Syndrome (HES) diagnosed.  Patient presents with [chief complaint e.g., persistent cough, fatigue, shortness of breath, skin rash, or other relevant symptom].  Physical examination reveals [document specific findings e.g., splenomegaly, cardiopulmonary abnormalities, skin lesions, or neurologic deficits].  Complete blood count (CBC) demonstrates marked eosinophilia with an absolute eosinophil count (AEC) persistently greater than 1500 cellsmcL confirmed on at least two separate occasions.  Bone marrow biopsy [performed or pending, results if available].  Serum tryptase level [measured or pending, results if available].  Cardiac evaluation including echocardiogram [performed, scheduled, or pending, results if available] to assess for endomyocardial fibrosis.  Pulmonary function tests [performed or pending, results if available].  Differential diagnosis includes secondary causes of eosinophilia such as parasitic infections, allergic reactions, drug reactions, and other hematologic malignancies.  These have been ruled out based on [explain basis for exclusion e.g., negative stool ova and parasites, negative allergen testing, review of medications, or other relevant tests].  Molecular testing for FIP1L1-PDGFRA fusion gene [performed or pending, results if available].  Given the persistent eosinophilia and clinical presentation, the diagnosis of Hypereosinophilic Syndrome is made.  Initiating treatment with [specify medication e.g., corticosteroids, tyrosine kinase inhibitors such as imatinib, or other relevant therapies].  Patient education provided on disease process, treatment plan, potential side effects of medications, and the importance of regular monitoring.  Follow-up scheduled in [ timeframe e.g., two weeks] to assess treatment response and adjust therapy as needed.  ICD-10 code D47.2, Hypereosinophilia, assigned.