Sickle-cell thalassemia, unspecified, with crisis

This code identifies a form of sickle cell disease where an individual inherits one gene for sickle hemoglobin and one gene for beta-thalassemia, resulting in sickle-beta thalassemia. The "unspecified" modifier indicates that the specific type of beta-thalassemia (e.g., beta-zero or beta-plus) is not documented. The "with crisis" component signifies an acute exacerbation of the disease, such as a vaso-occlusive crisis, acute chest syndrome, or splenic sequestration.

Use this code when documentation confirms a diagnosis of sickle-cell thalassemia and the patient is experiencing an acute crisis, but the specific type of beta-thalassemia is not specified. This code is appropriate for inpatient or outpatient encounters where the crisis is the primary reason for the visit or a significant co-morbidity. Documentation should clearly state "sickle-cell thalassemia with crisis" without further specification of the thalassemia type.

• Do not use this code if the specific type of beta-thalassemia (e.g., beta-zero or beta-plus) is documented; instead, select a more specific code from the D57.4- subcategory.
• Ensure the documentation explicitly states "with crisis" to support the fifth character. If no crisis is present, a different code from the D57.4- subcategory should be chosen.
• Sequence this code as the principal diagnosis when the crisis is the reason for admission or the primary focus of the encounter.