2007 ICD-9-CM Procedure 28.0 Incision and drainage of tonsil and peritonsillar structures 28.0 is a specific code that can be used to specify a procedure 28.0 contains 12 index entries View the full Volume 3 28.* hierarchy 28.0 also known as: Drainage (oral) (transcervical) of: parapharyngeal abscess peritonsillar abscess retropharyngeal abscess tonsillar abscess Index entries containing 28.0: Drainage abscess -- see also Drainage, by site and Incision, by site parapharyngeal (oral) (transcervical) 28.0 peritonsillar (oral) (transcervical) 28.0 retropharyngeal (oral) (transcervical) 28.0 tonsil, tonsillar (oral) (transcervical) 28.0 parapharyngeal 28.0 peritonsillar 28.0 retropharyngeal 28.0 tonsil 28.0 Incision (and drainage) parapharyngeal (oral) (transcervical) 28.0 retropharyngeal (oral) (transcervical) 28.0 tonsil 28.0 Tonsillotomy 28.0