2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Other Diseases Of Upper Respiratory Tract 470-478 > Other Diseases Of Upper Respiratory Tract 478.* > 2008 ICD-9-CM Diagnosis 478.6 Edema of larynx  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 478.6 can be accessed here. Edema of any region of the larynx from a variety of causes. In the earliest stages it may be difficult to differentiate from infection, although mucosal injection and erythema are found more often in the latter. Allergic edema may result as a response from provocation induced by foods, inhalants, and drugs. The entire respiratory tract or only an isolated portion of the larynx may be affected. Laryngeal edema may also be hereditary. Other possible causes of laryngeal edema include increased capillary pressure due to superior vena cava syndrome, internal jugular vein ligation, lowered plasma osmotic failure induced by renal failure, impaired lymphatic flow, and increased capillary permeability to proteins. (From Paparella et al., Otolaryngology, 3d ed, p2253) 478.6 is a specific code that can be used to specify a diagnosis 478.6 contains 4 index entries View the ICD-9-CM Volume 1 478.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 478.6 also known as: Edema (of): glottis subglottic supraglottic Index entries containing 478.6: Edema, edematous 782.3 glottis, glottic, glottides (obstructive) (passive) 478.6 allergic 995.1 hereditary 277.6 due to external agent - see Condition, respiratory, acute, due to specified agent larynx (see also Edema, glottis) 478.6 subglottic (see also Edema, glottis) 478.6 supraglottic (see also Edema, glottis) 478.6