ICD-10 Code L03.042 – Acute lymphangitis of left toe (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.042 – Acute lymphangitis of left toe
What it is
This code identifies an acute infection and inflammation of the lymphatic vessels in the left toe. It is used when the condition is documented as lymphangitis affecting that specific toe.
Clinical signs
Typical findings include localized redness, tenderness, swelling, and red streaking that may extend from the toe. Clinical features vary; refer to documentation.
When to use this code
Use L03.042 when the provider documents acute lymphangitis limited to the left toe. It fits cases where the infection is clearly identified as involving lymphatic channels rather than only skin or soft tissue. If the note is nonspecific about laterality or site, check documentation before assigning the code.
Do not use for
Do not use this code for cellulitis, abscess, or lymphangitis of another foot location unless the left toe is specifically documented. Check documentation if the record does not confirm acute lymphangitis.
Coding tip
Verify both acuity and laterality in the provider note before coding.