ICD-10 Code L03.818 – Cellulitis of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L03.818 – Cellulitis of other sites
What it is
This code identifies cellulitis affecting a site not named by a more specific ICD-10 code. Use it when the record documents bacterial skin and soft tissue inflammation, but the location is described only as “other site.”
Clinical signs
Typical findings include localized redness, warmth, swelling, and tenderness of the affected skin. Clinical features vary; refer to documentation if the site, extent, or cause is unclear.
When to use this code
Use L03.818 when the provider documents cellulitis at a specific body area that is not covered by a more specific cellulitis code. It is appropriate when the note clearly supports cellulitis but does not name a different, more exact ICD-10 option.
If the record says “cellulitis” without a site, check documentation. You should also verify whether another code better matches an abscess, wound infection, or a different skin condition.
Do not use for
Do not use this code for cellulitis of the face, finger, toe, or other sites with a more specific code. Do not use it when documentation supports a different diagnosis; check documentation.
Coding tip
Match the code to the exact documented site and choose a more specific cellulitis code whenever the record supports one.