ICD-10-CM Code For Pityriasis Rosea: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group L42 includes pityriasis rosea and related papulosquamous skin eruptions characterized by herald patches and subsequent widespread scaly lesions. These ICD-10-CM diagnosis codes are used to document new or established cases of pityriasis rosea, capturing disease distribution, morphology, and clinical course relevant to dermatologic management. Accurate coding within the ICD-10-CM L42 group supports proper claim adjudication and complete clinical documentation.

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ICD-10-CM L42: Pityriasis Rosea Overview

The ICD-10-CM L42 group includes pityriasis rosea and related papulosquamous eruptions of the skin, primarily affecting the epidermis with characteristic scaly rashes. These conditions target the integumentary system and are commonly encountered in dermatology practice. Accurate coding matters for reimbursement and ensures clinical records reflect the correct diagnosis and treatment course.

When to Use

Use a code from this group when the clinical diagnosis is pityriasis rosea or a closely related papulosquamous eruption confirmed by the treating clinician. Codes are applied to document encounters for evaluation, treatment, or ongoing management of the condition.

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
L42	Pityriasis rosea

DRG Codes

2 rows

DRG Code	Description
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC

Typical Clinical Scenarios

A previously healthy 16-year-old adolescent presents to primary care with a 2-week history of a herald patch followed days later by multiple oval, slightly scaly erythematous plaques distributed along skin cleavage lines on the trunk and proximal limbs. Symptoms include mild pruritus but no systemic signs; the clinician documents the characteristic rash pattern and assigns a diagnosis from this group after excluding tinea corporis and secondary syphilis. Typical codes: L42
A 28-year-old pregnant patient in the second trimester is referred to dermatology for evaluation of a new-onset widespread papulosquamous eruption that began acutely one week prior and causes moderate itching affecting sleep. After history, exam, and negative tests for infectious mimickers, the dermatologist records a diagnosis from this group to guide monitoring and symptomatic management during pregnancy. Typical codes: L42
An elderly patient with multiple comorbidities presents to urgent care for worsening pruritic, scaly patches that started as a single patch three weeks earlier and now involve the back and chest; the clinician documents the eruption as benign and self-limited but notes secondary excoriations from scratching and prescribes symptomatic treatment. Because the primary skin disorder matches the classic clinical pattern, a diagnosis from this group is assigned and recorded for the visit. Typical codes: L42

Related Codes

L40-PSORIASIS

ICD-10-CM Code For Psoriasis: Group Overview

L41-PARAPSORIASIS

ICD-10-CM Code For Parapsoriasis: Group Overview

L43-LICHEN-PLANUS

ICD-10-CM Code For Lichen Planus: Group Overview

L44-OTHER-PAPULOSQUAMOUS-DISORDERS

ICD-10-CM Code For Other Papulosquamous Disorders: Group Overview

L45-PAPULOSQUAMOUS-DISORDERS-IN-DISEASES-CLASSIFIED-ELSEWHERE

ICD-10-CM Code For Papulosquamous Disorders In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
L42	Pityriasis rosea

DRG Codes

2 rows

DRG Code	Description
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC

Typical Clinical Scenarios

A previously healthy 16-year-old adolescent presents to primary care with a 2-week history of a herald patch followed days later by multiple oval, slightly scaly erythematous plaques distributed along skin cleavage lines on the trunk and proximal limbs. Symptoms include mild pruritus but no systemic signs; the clinician documents the characteristic rash pattern and assigns a diagnosis from this group after excluding tinea corporis and secondary syphilis. Typical codes: L42
A 28-year-old pregnant patient in the second trimester is referred to dermatology for evaluation of a new-onset widespread papulosquamous eruption that began acutely one week prior and causes moderate itching affecting sleep. After history, exam, and negative tests for infectious mimickers, the dermatologist records a diagnosis from this group to guide monitoring and symptomatic management during pregnancy. Typical codes: L42
An elderly patient with multiple comorbidities presents to urgent care for worsening pruritic, scaly patches that started as a single patch three weeks earlier and now involve the back and chest; the clinician documents the eruption as benign and self-limited but notes secondary excoriations from scratching and prescribes symptomatic treatment. Because the primary skin disorder matches the classic clinical pattern, a diagnosis from this group is assigned and recorded for the visit. Typical codes: L42

Related Codes

L40-PSORIASIS

ICD-10-CM Code For Psoriasis: Group Overview

L41-PARAPSORIASIS

ICD-10-CM Code For Parapsoriasis: Group Overview

L43-LICHEN-PLANUS

ICD-10-CM Code For Lichen Planus: Group Overview

L44-OTHER-PAPULOSQUAMOUS-DISORDERS

ICD-10-CM Code For Other Papulosquamous Disorders: Group Overview

L45-PAPULOSQUAMOUS-DISORDERS-IN-DISEASES-CLASSIFIED-ELSEWHERE

ICD-10-CM Code For Papulosquamous Disorders In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Pityriasis Rosea: Group Overview

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ICD-10-CM L42: Pityriasis Rosea Overview

ICD-10-CM Code For Pityriasis Rosea: Group Overview

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ICD-10-CM L42: Pityriasis Rosea Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What diagnosis is represented by `L42` in ICD-10-CM?

When should a clinician use codes from the `L42` group?

How does accurate coding of `L42` impact reimbursement?

Which DRGs are related to minor skin disorders that may include `L42` diagnoses?

What clinical features are captured by the `L42` code group in documentation?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What diagnosis is represented by `L42` in ICD-10-CM?

When should a clinician use codes from the `L42` group?

How does accurate coding of `L42` impact reimbursement?

Which DRGs are related to minor skin disorders that may include `L42` diagnoses?

What clinical features are captured by the `L42` code group in documentation?

References