D57.03

HCC Category Mapping

What This Code Means

Sickle cell disease with an acute crisis involving stroke or other blood vessel problems in the brain due to sickled red blood cells blocking blood flow.

Coding Tips

• •Coordinate with neurology documentation or imaging reports confirming cerebrovascular event
• •Document whether this is acute stroke, transient ischemic attack, or other cerebrovascular involvement during crisis

Clinical Significance

Cerebral vascular involvement in Hemoglobin SS disease represents one of the most devastating complications of sickle cell disease, including ischemic stroke, hemorrhagic stroke, transient ischemic attacks, and silent cerebral infarcts. Stroke occurs in approximately 11% of children with Hemoglobin SS disease by age 20. The sickled red blood cells cause large vessel vasculopathy in the Circle of Willis, leading to stenosis, occlusion, and moyamoya-pattern collaterals with significant long-term neurological disability.

Documentation Requirements

• ✓Documentation must include Hemoglobin SS genotype, neurological examination findings, neuroimaging results (Magnetic Resonance Imaging, Magnetic Resonance Angiography, or Computed Tomography), and the specific cerebrovascular event type (ischemic stroke, hemorrhagic stroke, transient ischemic attack, or silent cerebral infarct).
• ✓Record transcranial Doppler results if available, chronic transfusion therapy protocol, and neurological deficits.
• ✓Document whether this is a new event or recurrence.

Commonly Confused Codes