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L42 — Pityriasis rosea
L42
What this code means
Pityriasis rosea is a self-limiting rash of oval pink patches, often starting with a single larger 'herald' patch.
Also called: pityriasis rosea.
When this code is used
Used for pityriasis rosea.
Where it sits in ICD-10-CM
Code L42 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
Frequently asked questions
What is ICD-10-CM code L42?
L42 is the ICD-10-CM diagnosis code for “Pityriasis rosea”. Pityriasis rosea is a self-limiting rash of oval pink patches, often starting with a single larger 'herald' patch.
When is code L42 used?
Used for pityriasis rosea. 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.