2007 ICD-9-CM Procedure 29.91 Dilation of pharynx 29.91 is a specific code that can be used to specify a procedure 29.91 contains 3 index entries View the full Volume 3 29.* hierarchy 29.91 also known as: Dilation of nasopharynx Index entries containing 29.91: Dilation choanae (nasopharynx) 29.91 nasopharynx 29.91 pharynx 29.91