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ALL MEDICAL CODES IN CATEGORY I27.83 falls under the broader category of pulmonary heart disease and diseases of pulmonary circulation (I26-I28) within Chapter 9 of ICD-10-CM, which covers diseases of the circulatory system.

2025 ICD-10-CM code I27.83

Eisenmenger syndrome, a severe form of pulmonary hypertension with a right-to-left shunt due to a congenital heart defect.