Convert to ICD-10-CM: 
435.3 converts approximately to:
- 2015/16 ICD-10-CM G45.0 Vertebro-basilar artery syndrome
 ICD-9-CM Volume 2 Index entries containing back-references to 
435.3:
- Insufficiency, insufficient vertebrobasilar artery 435.3 vertebrobasilar artery 435.3
 
- Spasm, spastic, spasticity (see also condition) 781.0