ICD-10 Code L03.221 – Cellulitis of Neck (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.221 – Cellulitis of neck
What it is
L03.221 identifies cellulitis affecting the neck. It means a bacterial skin and soft-tissue infection in that anatomic area, usually involving the deeper skin layers and surrounding tissues.
Clinical signs
Typical findings include localized redness, warmth, swelling, tenderness, and spreading skin inflammation on the neck. Clinical features vary; refer to documentation if the note does not clearly describe infection of the neck skin.
When to use this code
Use this code when the record documents cellulitis specifically involving the neck, including entries such as “neck cellulitis” or “infected neck skin.” Apply it when the provider identifies the neck as the infected site, even if the note also describes surrounding soft tissue involvement. If the location is unclear, check documentation before coding.
Do not use for
Do not use L03.221 for abscess without cellulitis, generalized skin infection without neck involvement, or noninfectious neck swelling. If the diagnosis is uncertain or another site is documented, check documentation.
Coding tip
Confirm the anatomic site in the assessment or final diagnosis before assigning L03.221.