ICD-10 Code J33.1 – Polypoid sinus degeneration (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J33.1 – Polypoid sinus degeneration
What it is
J33.1 identifies polypoid degeneration of the sinus mucosa, meaning the lining of a sinus has become swollen and polyp-like. It is used when documentation describes this specific nonmalignant change.
Clinical signs
Clinical features may include chronic nasal blockage, sinus pressure, or visible polypoid tissue on exam. Clinical features vary; refer to documentation.
When to use this code
Use J33.1 when the record specifically states polypoid sinus degeneration or a similar polypoid change of the sinus mucosa. Apply it when the provider documents this as the diagnosis, rather than a general sinusitis or nasal polyp note. Check documentation if the site or diagnosis is unclear.
Do not use for
Do not use this code for ordinary nasal polyps, acute sinusitis, or unspecified sinus disease unless the provider clearly documents polypoid sinus degeneration. Do not guess the condition from symptoms alone.
Coding tip
Confirm the exact wording and anatomic site in the note before assigning J33.1.