2007 ICD-9-CM Procedure 85.23 Subtotal mastectomy 85.23 is a specific code that can be used to specify a procedure 85.23 contains 5 index entries View the full Volume 3 85.* hierarchy 85.23 excludes: quadrant resection (85.22) Index entries containing 85.23: Excision breast -- see also Mastectomy 85.41 segmental 85.23 Hemimastectomy (radical) 85.23 Mastectomy (complete) (prophylactic) (simple) (unilateral) 85.41 partial 85.23 subtotal 85.23 Resection -- see also Excision, by site breast -- see also Mastectomy segmental 85.23