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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Other Diseases Of Upper Respiratory Tract 470-478 > 2007 ICD-9-CM Diagnosis 473 Chronic sinusitis  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 Therefore, this code may be out of date.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 473 can be accessed here. 473 is a non-specific code that cannot be used to specify a diagnosis 473 includes: abscess (chronic) of sinus (accessory) (nasal) empyema (chronic) of sinus (accessory) (nasal) infection (chronic) of sinus (accessory) (nasal) suppuration (chronic) of sinus (accessory) (nasal) 473 excludes: acute sinusitis (461.0-461.9)