What is the icd code for rhino sinusitis?

There is no actual diagnosis of rhino-sinusitis. There are various types of rhinitis, as well as various types of sinusitis. For example, chronic rhinitis would be 472.0; allergic rhinitis(cause unspecified) would be 477.9. Chronic, unspecified sinusitis would be 473.9. It really depends on what exactly you are looking for.