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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 > ICD-9-CM Diagnosis 473 Chronic sinusitis 473 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 473.0 Chronic maxillary sinusitis 473.0 is a specific code that can be used to specify a diagnosis 473.0 contains 27 index entries ICD-9-CM Diagnosis 473.1 Chronic frontal sinusitis 473.1 is a specific code that can be used to specify a diagnosis 473.1 contains 10 index entries ICD-9-CM Diagnosis 473.2 Chronic ethmoidal sinusitis 473.2 is a specific code that can be used to specify a diagnosis 473.2 contains 9 index entries ICD-9-CM Diagnosis 473.3 Chronic sphenoidal sinusitis 473.3 is a specific code that can be used to specify a diagnosis 473.3 contains 9 index entries ICD-9-CM Diagnosis 473.8 Other chronic sinusitis 473.8 is a specific code that can be used to specify a diagnosis 473.8 contains 2 index entries ICD-9-CM Diagnosis 473.9 Unspecified sinusitis (chronic) An inflammatory process of the mucous membranes of the paranasal sinuses that occurs in three stages: acute, subacute, and chronic. Sinusitis results from any condition causing ostial obstruction or from pathophysiologic changes in the mucociliary transport mechanism. 473.9 is a specific code that can be used to specify a diagnosis 473.9 contains 37 index entries