ICD-10 Code L03.1 – Cellulitis and acute lymphangitis of other parts of limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.1 – Cellulitis and acute lymphangitis of other parts of limb
What it is
L03.1 identifies a bacterial skin and soft tissue infection affecting an arm or leg, with possible spread through nearby lymphatic vessels. Use it when documentation states cellulitis or acute lymphangitis in an extremity location other than the hand or foot.
Clinical signs
Typical findings include localized redness, warmth, swelling, tenderness, and sometimes streaking along lymphatic channels. Clinical features vary; refer to documentation, especially for the exact limb site and whether lymphangitis is present.
When to use this code
Assign L03.1 when the record clearly documents cellulitis or acute lymphangitis in an arm or leg segment, such as the forearm, upper arm, lower leg, or thigh. Use the code when the provider specifies an extremity site and does not document a more specific codeable diagnosis.
If the note says “cellulitis of limb” without naming hand or foot, this code may fit. Check documentation for laterality, exact anatomic site, and any related abscess or wound that may change coding.
Do not use for
Do not use L03.1 for cellulitis of the hand or foot, which has separate codes. Also avoid it when the condition is a noninfectious dermatitis, venous stasis change, or another skin disorder.
Coding tip
Code the most specific limb site documented, and verify whether the infection is cellulitis, lymphangitis, or both before assigning L03.1.