ICD-10 Code L03.90 – Cellulitis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.90 – Cellulitis, unspecified
What it is
L03.90 identifies cellulitis when the affected site or cause is not further specified. Use it for a bacterial skin and soft tissue infection documented simply as cellulitis.
Clinical signs
Typical findings include localized redness, warmth, swelling, and tenderness of the skin. Clinical features vary; refer to documentation for the exact site and any stated severity.
When to use this code
Use this code when the record states cellulitis but does not name a specific body area, such as the leg, face, or arm. It also fits cases where the provider documents cellulitis without enough detail to assign a more specific code. If the note later identifies the site, code the more specific option instead.
Do not use for
Do not use it for abscess, erysipelas, dermatitis, or other non-cellulitis skin conditions. If the documentation specifies a body site or different diagnosis, check documentation and select the correct code.
Coding tip
Query for the anatomic site whenever possible, because unspecified cellulitis is less precise than a site-specific code.