2007 ICD-9-CM Procedure 16.01 Orbitotomy with bone flap 16.01 is a specific code that can be used to specify a procedure 16.01 contains 5 index entries View the full Volume 3 16.* hierarchy 16.01 also known as: Orbitotomy with lateral approach Index entries containing 16.01: Kroenlein operation (lateral orbitotomy) 16.01 Operation Kroenlein (lateral orbitotomy) 16.01 Orbitotomy (anterior) (frontal) (temporofrontal) (transfrontal) NEC 16.09 with bone flap 16.01 Kroenlein (lateral) 16.01 lateral 16.01