ICD-10 Code J35.01 – Chronic tonsillitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J35.01 – Chronic tonsillitis
What it is
Chronic tonsillitis is long-standing inflammation or infection of the palatine tonsils. Use this code when the record describes persistent or recurrent tonsillar disease rather than an acute episode.
Clinical signs
Common findings include recurrent sore throat, enlarged or cryptic tonsils, tonsillar debris, and persistent throat discomfort. Clinical features vary; refer to documentation.
When to use this code
Use J35.01 when the provider documents chronic tonsillitis, recurrent tonsillitis, or ongoing tonsillar inflammation. It may also fit follow-up visits for persistent tonsillar symptoms when the diagnosis is clearly established in the chart.
Do not use for
Do not use this code for acute tonsillitis or unspecified tonsil symptoms without a confirmed chronic diagnosis. Check documentation if the record only mentions pharyngitis, sore throat, or tonsil enlargement.
Coding tip
Code the chronic diagnosis only when the provider clearly distinguishes it from an acute infection or another throat condition.