Convert to ICD-10-CM: 
378.56 converts approximately to:
- 2015/16 ICD-10-CM H49.30 Total (external) ophthalmoplegia, unspecified eye
 ICD-9-CM Volume 2 Index entries containing back-references to 
378.56:
- Ophthalmoplegia (see also Strabismus) 378.9  total (external) 378.56 total (external) 378.56