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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Acute Respiratory Infections 460-466 > Acute Sinusitis 461.* > 2008 ICD-9-CM Diagnosis 461.9 Acute sinusitis unspecified  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 Therefore, this code may be out of date.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 461.9 can be accessed here. 461.9 is a specific code that can be used to specify a diagnosis 461.9 contains 1 index entry View the ICD-9-CM Volume 1 461.* hierarchy 461.9 also known as: Acute sinusitis NOS Index entries containing 461.9: Sinusitis (accessory) (nasal) (hyperplastic) (nonpurulent) (purulent) (chronic) 473.9 acute 461.9 ethmoidal 461.2 frontal 461.1 maxillary 461.0 specified type NEC 461.8 sphenoidal 461.3