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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 > Nasal Polyps 471.* > 2007 ICD-9-CM Diagnosis 471.0 Polyp of nasal cavity  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 Therefore, this code may be out of date.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 471.0 can be accessed here. Focal accumulations of EDEMA fluid in the NASAL MUCOSA accompanied by HYPERPLASIA of the associated submucosal connective tissue. Polyps may be NEOPLASMS, foci of INFLAMMATION, degenerative lesions, or malformations. 471.0 is a specific code that can be used to specify a diagnosis 471.0 contains 5 index entries View the ICD-9-CM Volume 1 471.* hierarchy 471.0 also known as: Polyp: choanal nasopharyngeal Index entries containing 471.0: Polyp, polypus adenoid tissue 471.0 choanal 471.0 nares posterior 471.0 nasal (mucous) 471.9 cavity 471.0 nasopharyngeal 471.0