2007 ICD-9-CM Procedure 99.23 Injection of steroid 99.23 is a specific code that can be used to specify a procedure 99.23 contains 4 index entries View the full Volume 3 99.* hierarchy 99.23 also known as: Injection of cortisone Subdermal implantation of progesterone Index entries containing 99.23: Implant, implantation estradiol (pellet) 99.23 progesterone (subdermal) 99.23 Injection (into) (hypodermically) (intramuscularly) (intravenously) (acting locally or systemically) cortisone 99.23 steroid NEC 99.23