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L03.90 — Cellulitis, unspecified
L03.90
What this code means
Cellulitis is a bacterial infection of the skin and the tissues beneath it, causing spreading redness, pain and swelling.
Also called: cellulitis, skin infection.
When this code is used
Used for cellulitis when the site is not specified.
Where it sits in ICD-10-CM
Code L03.90 belongs to Chapter 12: Diseases of the skin and subcutaneous tissue, which covers codes L00–L99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code L03.90?
L03.90 is the ICD-10-CM diagnosis code for “Cellulitis, unspecified”. Cellulitis is a bacterial infection of the skin and the tissues beneath it, causing spreading redness, pain and swelling.
When is code L03.90 used?
Used for cellulitis when the site is not specified. It belongs to Chapter 12 of ICD-10-CM (Diseases of the skin and subcutaneous tissue).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.