Cerebellar or brain stem laceration without open intracranial wound with loss of consciousness of unspecified duration
Convert to ICD-10-CM: 
851.66 converts approximately to:
- 2015/16 ICD-10-CM S06.379A Contusion, laceration, and hemorrhage of cerebellum with loss of consciousness of unspecified duration, initial encounterOr: 
- 2015/16 ICD-10-CM S06.389A Contusion, laceration, and hemorrhage of brainstem with loss of consciousness of unspecified duration, initial encounter