Convert to ICD-10-CM: 
921.0 converts approximately to:
- 2015/16 ICD-10-CM S00.10XA Contusion of unspecified eyelid and periocular area, initial encounter
 ICD-9-CM Volume 2 Index entries containing back-references to 
921.0:
- Black eye NEC 921.0 eye NEC 921.0
 
- Ecchymosis (multiple) 459.89  eye (traumatic) 921.0 eye (traumatic) 921.0