R21
BillableRash and other nonspecific skin eruption
R21 is the ICD-10-CM code for Rash and other nonspecific skin eruption. It is a billable, specific code valid for reimbursement.
- Status
- Billable
- Chapter
- R00-R99
- Edition
- FY2026
R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
What this means — in plain language
MedlinePlus · NIHA rash is an area of irritated or swollen skin. Many rashes are itchy, red, painful, and irritated. Some rashes can also lead to blisters or patches of raw skin. Rashes are a symptom of many different medical problems. Other causes include irritating substances and allergies. Certain genes can make people more likely to get rashes. Contact dermatitis is a common type of rash. It causes redness, itching, and…
Read more about Rashes at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •rash NOS
Excludes1 — not coded here
- •specified type of rash- code to condition
- •vesicular eruption (R23.8)
Frequently asked questions
- What is ICD-10 code R21?
- R21 is the ICD-10-CM code for "Rash and other nonspecific skin eruption". It falls under R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
- Is R21 a billable code?
- Yes — R21 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from R21?
- Excludes1 (not coded here): specified type of rash- code to condition; vesicular eruption (R23.8).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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