ICD-10 Code J35.03 – Chronic tonsillitis and adenoiditis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J35.03 – Chronic tonsillitis and adenoiditis
What it is
J35.03 identifies ongoing inflammation of both the tonsils and adenoids. Use it when the record documents a chronic or recurrent condition involving these lymphoid tissues.
Clinical signs
Typical findings include repeated sore throat, enlarged tonsils or adenoids, and persistent throat discomfort. Clinical features vary; refer to documentation.
When to use this code
Use J35.03 when the clinician documents chronic tonsillitis with adenoiditis, or a chronic combined disorder of both structures. It fits cases described as recurrent, persistent, or longstanding inflammation. If the note mentions only one site, code the documented site instead.
Do not use for
Do not use this code for acute tonsillitis, acute adenoiditis, or nonspecific throat infection. Check documentation if the provider does not clearly state chronic involvement of both tonsils and adenoids.
Coding tip
Confirm both anatomic sites and the chronic nature of the condition before assigning J35.03.