D56.0 Alpha thalassemia

Alpha thalassemia major
Hemoglobin H Constant Spring
Hemoglobin H disease
Hydrops fetalis due to alpha thalassemia
Severe alpha thalassemia
Triple gene defect alpha thalassemia

Excludes1: alpha thalassemia trait or minor (D56.3)
asymptomatic alpha thalassemia (D56.3)
hydrops fetalis due to isoimmunization (P56.0)
hydrops fetalis not due to immune hemolysis (P83.2)

Use additional code: code, if applicable, for hydrops fetalis due to alpha thalassemia (P56.99)