ICD-10 Code L03.123 – Acute lymphangitis of right upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.123 – Acute lymphangitis of right upper limb
What it is
L03.123 identifies acute lymphangitis affecting the right upper limb. It means an acute infection or inflammation of lymphatic vessels in the right arm, usually linked to a nearby skin or soft tissue infection.
Clinical signs
Typical findings include red streaking extending from an infected area toward regional lymph nodes, localized tenderness, swelling, and warmth. Fever or malaise may occur; clinical features vary, so refer to documentation.
When to use this code
Use this code when the record clearly documents acute lymphangitis in the right upper limb, not just cellulitis or a nonspecific arm infection. You should also confirm laterality and acuity in the provider note. If the documentation only says “lymphangitis” without site, check documentation.
Do not use for
Do not use it for left-sided or unspecified upper-limb disease, or for chronic lymphatic disorders. Avoid this code when the note describes cellulitis alone without lymphangitic involvement.
Coding tip
Verify the right-side laterality and the word “acute” in the assessment before assigning L03.123.