2007 ICD-9-CM Procedure 73.91 External version 73.91 is a specific code that can be used to specify a procedure 73.91 contains 2 index entries View the full Volume 3 73.* hierarchy Index entries containing 73.91: Version, obstetrical (bimanual) (cephalic) (combined) (internal) (podalic) 73.21 external (bipolar) 73.91 Wigand's (external) 73.91