2007 ICD-9-CM Procedure 85.43 Unilateral extended simple mastectomy (mas-TEK-toe-mee) Surgery for breast cancer in which the breast, some of the lymph nodes under the arm, the lining over the chest muscles, and sometimes part of the chest wall muscles are removed. Total mastectomy with axillary node dissection, but with preservation of the pectoral muscles. 85.43 is a specific code that can be used to specify a procedure 85.43 contains 4 index entries View the full Volume 3 85.* hierarchy 85.43 also known as: Extended simple mastectomy NOS Modified radical mastectomy Simple mastectomy with excision of regional lymph nodes Index entries containing 85.43: Mastectomy (complete) (prophylactic) (simple) (unilateral) 85.41 with excision of regional lymph nodes 85.43 bilateral 85.44 extended simple (with regional lymphadenectomy) (unilateral) 85.43 bilateral 85.44 modified radical (unilateral) 85.43 bilateral 85.44 radical (Halsted) (Meyer) (unilateral) 85.45 modified (unilateral) 85.43 bilateral 85.44