ICD-10 Code L03.021 – Acute lymphangitis of right finger (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.021 – Acute lymphangitis of right finger
What it is
L03.021 identifies acute lymphangitis affecting the right finger. It describes an acute infection or inflammation spreading through lymphatic channels in that finger.
Clinical signs
Typical findings include localized redness, swelling, warmth, and tenderness, sometimes with red streaking extending proximally. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents acute lymphangitis limited to the right finger. It fits cases where the infection is clearly identified as involving lymphatic vessels rather than only superficial skin. If laterality or anatomic site is unclear, check documentation before assigning the code.
Do not use for
Do not use it for nonspecific cellulitis, abscess, or infection of another finger or hand site. If the record does not support acute lymphangitis, check documentation.
Coding tip
Verify both laterality and the exact site in the note before coding, because this code is specific to the right finger.