2027 ICD-10-CM Diagnosis Code L42Pityriasis rosea
ICD-10-CM Codes›L00–L99›L40-L45›L42
- Billable — Valid for Submission
- Chronic Condition
L42 is a billable ICD-10-CM diagnosis code for pityriasis rosea. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Pityriasis rosea
- Pityriasis rosea-like drug eruption
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L42: its own notes plus those printed at Chapter 12. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- lipomelanotic reticulosis (I89.8)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- viral warts (B07.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Pityriasis Rosea
a mild exanthematous inflammation of unknown etiology. it is characterized by the presence of salmon-colored maculopapular lesions. the most striking feature is the arrangement of the lesions such that the long axis is parallel to the lines of cleavage. the eruptions are usually generalized, affecting chiefly the trunk, and the course is often self-limiting.
Patient EducationClinical
Skin Conditions
Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:
The full article covers:
- What does your skin do?
- What problems and conditions can affect your skin?
- How can I keep my skin healthy?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L42 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L42Overview
What is the ICD-10 code for pityriasis rosea?
The ICD-10-CM code for pityriasis rosea is L42. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L42 (Pityriasis rosea) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pityriasis rosea on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L42 group to?
When pityriasis rosea is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of L42?
Under the General Equivalence Mappings, pityriasis rosea converts to ICD-9-CM 696.3 (pityriasis rosea). The mapping is a direct match.
