ICD-10-CM Code For Rash And Other Nonspecific Skin Eruption: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group R21 includes nonspecific rashes and skin eruptions such as generalized rashes, maculopapular eruptions, and other unspecified skin presentations that lack a more specific dermatologic diagnosis. These ICD-10-CM diagnosis codes are used to document acute or chronic cutaneous presentations when a more definitive etiology is not established, capturing clinical features like distribution, severity, and associated symptoms when relevant. Accurate coding within the ICD-10-CM R21 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM R21: Rash And Other Nonspecific Skin Eruption Overview

This group represents nonspecific rashes and skin eruptions affecting the integumentary system, including acute or unspecified maculopapular rashes, generalized eruptions, and other nonspecific presentations. Accurate coding ensures the clinical picture is clearly documented and supports correct claim processing and reimbursement. Precise selection of codes within this group helps reflect severity and clinical context for downstream care and billing.

When to Use

Use a code from this group when the clinical record documents a rash or nonspecific skin eruption without a more specific underlying diagnosis. Codes in this group are appropriate for encounters focused on evaluating or treating undifferentiated skin rashes or when the rash remains unspecified after assessment.

ICD-10-CM Codes

1 rows

ICD-10-CM Code	Description
R21	Rash and other nonspecific skin eruption

DRG Codes

2 rows

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

Typical Clinical Scenarios

An adult presents to urgent care with an acute, diffuse pruritic red rash that began after exposure to a new topical lotion; there are no vesicles, fever, or systemic symptoms and the clinician documents a nonspecific erythematous eruption without a clear allergic diagnosis, so a nonspecific skin eruption code is assigned. Typical codes: R21
A pediatric patient is seen in primary care for a recent-onset maculopapular rash noted by parents over several days without identified infectious etiology or identified dermatologic condition; the visit is for evaluation and symptomatic management, and the provider records a nonspecific skin eruption when no definitive diagnosis is established. Typical codes: R21
An elderly nursing home resident develops a new generalized rash while on multiple medications; the rash is nonvesicular and the team documents a nonspecific skin eruption as a comorbidity complicating care while medication review and further workup are pending. Typical codes: R21

Related Codes

R20-DISTURBANCES-OF-SKIN-SENSATION

ICD-10-CM Code For Disturbances Of Skin Sensation: Group Overview

R22-LOCALIZED-SWELLING-MASS-LUMP

ICD-10-CM Code For Localized Swelling Mass And Lump Of Skin And Subcutaneous Tissue: Group Overview

R23-OTHER-SKIN-CHANGES

ICD-10-CM Code For Other Skin Changes: 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
R21	Rash and other nonspecific skin eruption

DRG Codes

2 rows

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

Typical Clinical Scenarios

An adult presents to urgent care with an acute, diffuse pruritic red rash that began after exposure to a new topical lotion; there are no vesicles, fever, or systemic symptoms and the clinician documents a nonspecific erythematous eruption without a clear allergic diagnosis, so a nonspecific skin eruption code is assigned. Typical codes: R21
A pediatric patient is seen in primary care for a recent-onset maculopapular rash noted by parents over several days without identified infectious etiology or identified dermatologic condition; the visit is for evaluation and symptomatic management, and the provider records a nonspecific skin eruption when no definitive diagnosis is established. Typical codes: R21
An elderly nursing home resident develops a new generalized rash while on multiple medications; the rash is nonvesicular and the team documents a nonspecific skin eruption as a comorbidity complicating care while medication review and further workup are pending. Typical codes: R21

Related Codes

R20-DISTURBANCES-OF-SKIN-SENSATION

ICD-10-CM Code For Disturbances Of Skin Sensation: Group Overview

R22-LOCALIZED-SWELLING-MASS-LUMP

ICD-10-CM Code For Localized Swelling Mass And Lump Of Skin And Subcutaneous Tissue: Group Overview

R23-OTHER-SKIN-CHANGES

ICD-10-CM Code For Other Skin Changes: 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 Rash And Other Nonspecific Skin Eruption: Group Overview

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ICD-10-CM R21: Rash And Other Nonspecific Skin Eruption Overview

ICD-10-CM Code For Rash And Other Nonspecific Skin Eruption: Group Overview

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ICD-10-CM R21: Rash And Other Nonspecific Skin Eruption Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does the ICD-10-CM group `R21` represent?

When should `R21` be used in clinical documentation?

How does accurate coding within `R21` affect claims and reimbursement?

Which related DRGs are associated with the `R21` group?

What clinical details should be included when using `R21` to improve coding accuracy?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

What does the ICD-10-CM group `R21` represent?

When should `R21` be used in clinical documentation?

How does accurate coding within `R21` affect claims and reimbursement?

Which related DRGs are associated with the `R21` group?

What clinical details should be included when using `R21` to improve coding accuracy?

References