Coding Guidelines

Inclusion Terms

  • 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 (Mutually Exclusive)

These codes should never be used together with D56.0

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

Use Additional Code

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

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