ICD-10 Code B48.1 – Rhinosporidiosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B48.1 – Rhinosporidiosis
What it is
Rhinosporidiosis is a chronic infection caused by Rhinosporidium seeberi, most often involving the nose or nasopharynx. It usually produces friable polypoid lesions and may extend to nearby mucosal sites.
Clinical signs
Typical findings include a slowly growing nasal mass, recurrent epistaxis, and nasal obstruction. Clinical features vary; refer to documentation if the site or appearance is not clearly stated.
When to use this code
Use B48.1 when the provider documents rhinosporidiosis as the confirmed diagnosis, whether in the nose, nasopharynx, or another mucosal site. Code it from pathology, operative, or specialist documentation when the infection is specifically named. If the record only says “nasal polyp” or “mass,” do not assume rhinosporidiosis without support.
Do not use for
Do not use this code for generic rhinitis, sinusitis, or benign nasal polyps without documented rhinosporidiosis. Check documentation if the lesion is described only as a tumor, granuloma, or fungal infection.
Coding tip
Confirm the exact anatomic site and the provider’s final diagnosis before assigning B48.1.