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L40.9 — Psoriasis, unspecified
L40.9
What this code means
Psoriasis is a chronic immune-mediated skin condition causing rapid skin-cell turnover and scaly plaques.
Also called: psoriasis.
When this code is used
Used for psoriasis when the type is not specified.
Where it sits in ICD-10-CM
Code L40.9 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 L40.9?
L40.9 is the ICD-10-CM diagnosis code for “Psoriasis, unspecified”. Psoriasis is a chronic immune-mediated skin condition causing rapid skin-cell turnover and scaly plaques.
When is code L40.9 used?
Used for psoriasis when the type 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.