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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Symptoms, Signs, And Ill-Defined Conditions 780-799 > Symptoms 780-789 > Symptoms Involving Head And Neck 784.* > 2007 ICD-9-CM Diagnosis 784.91 Postnasal drip This code may be outdated. View the most recent version of ICD-9-CM 784.91 784.91 is a specific code that can be used to specify a diagnosis 784.91 contains 2 index entries View the ICD-9-CM Volume 1 784.* hierarchy Index entries containing 784.91: Drip, postnasal (chronic) 784.91 due to: allergic rhinitis - see Rhinitis, allergic common cold 460 gastroesophageal reflux - see Reflux, gastroesophageal nasopharyngitis - see Nasopharyngitis other known condition - code to condition sinusitis - see Sinusitis Postnasal drip 784.91