ICD-10 Code L03.121 – Acute lymphangitis of right axilla (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.121 – Acute lymphangitis of right axilla
What it is
Acute lymphangitis of the right axilla is an acute infection or inflammation of the lymphatic vessels in the right armpit region. It usually reflects spread from a nearby skin or soft-tissue infection.
Clinical signs
Typical findings include localized tenderness, redness, warmth, and swelling along lymphatic channels near the right axilla. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents acute lymphangitis specifically involving the right axilla. It fits cases where the infection is acute and the laterality is clearly stated in the record. If the note only says lymphangitis without location, check documentation.
Do not use for
Do not use this code for chronic lymphatic disorders, nonspecific axillary pain, or cellulitis without lymphangitic involvement. If the right-sided location is not documented, do not assume it.
Coding tip
Confirm both acuity and right-sided axillary involvement in the provider note before assigning L03.121.