2008 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.* > 2008 ICD-9-CM Diagnosis 471.9 Unspecified nasal polyp  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 Therefore, this code may be out of date.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 471.9 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. 471.9 is a specific code that can be used to specify a diagnosis 471.9 contains 5 index entries View the ICD-9-CM Volume 1 471.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 471.9 also known as: Nasal polyp NOS Index entries containing 471.9: Polyp, polypus nares anterior 471.9 nasal (mucous) 471.9 cavity 471.0 septum 471.9 nose (mucous) 471.9 septum (nasal) 471.9