2007 ICD-9-CM Procedure 16.91 Retrobulbar injection of therapeutic agent 16.91 is a specific code that can be used to specify a procedure 16.91 contains 4 index entries View the full Volume 3 16.* hierarchy 16.91 excludes: injection of radiographic contrast material (87.14) opticociliary injection (12.79) Index entries containing 16.91: Injection (into) (hypodermically) (intramuscularly) (intravenously) (acting locally or systemically) eye (orbit) (retrobulbar) 16.91 anterior chamber 12.92 subconjunctival 10.91 nerve (cranial) (peripheral) 04.80 optic 16.91 orbit 16.91 retrobulbar (therapeutic substance) 16.91 for anesthesia -- omit code