ICD-10 Code J31.1 – Chronic Nasopharyngitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J31.1 – Chronic nasopharyngitis
What it is
J31.1 identifies chronic inflammation of the nasopharynx, the upper throat behind the nose. Use it when documentation specifically states chronic nasopharyngitis or a persistent nasopharyngeal inflammatory condition.
Clinical signs
Common findings may include ongoing throat irritation, postnasal drip, nasal congestion, or a sensation of mucus in the throat. Clinical features vary; refer to documentation.
When to use this code
Use J31.1 when the provider documents chronic nasopharyngitis as the diagnosis and the record supports a long-standing inflammatory process in the nasopharynx. It may fit recurring upper-airway inflammation without a more specific infectious cause. Check documentation if the note instead describes an acute illness or another nasal or pharyngeal disorder.
Do not use for
Do not use this code for acute nasopharyngitis, common cold, or other clearly identified infections unless the provider documents chronic nasopharyngitis. Do not assume it for nonspecific sore throat or rhinitis without confirmation.
Coding tip
Code only when “chronic nasopharyngitis” appears in the assessment, problem list, or final diagnosis.