Aphthous Ulcer ICD-10-CM Codes | 2025

Aphthous ulcers (canker sores) occur inside the mouth and are not contagious, while cold sores, caused by the herpes simplex virus, appear on the lips or around the mouth and are highly contagious. Cold sores also tend to form blisters, whereas aphthous ulcers present as flat, painful lesions with a white or yellow center.

Most aphthous ulcers heal on their own within 7 to 14 days without scarring. Severe or recurrent cases may take longer and sometimes require medical treatment.

Healthcare professionals typically recommend topical corticosteroids, antiseptic mouthwashes, or oral analgesics to reduce pain and inflammation. In chronic or severe cases, systemic treatments or investigations for underlying conditions may be necessary.