ICD-10-CM
ICD-10 code for Rash: R21
The ICD-10-CM index points "Rash" to R21, Rash and other nonspecific skin eruption. R21 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- A38.9canker, Scarlet fever, uncomplicatedBillable
- L22diaper, Diaper dermatitisBillable
- T88.1following immunization, Other complications following immunization, not elsewhere classifiedHeader
- L74.0heat, Miliaria rubraBillable
- L22napkin (psoriasiform), Diaper dermatitisBillable
- L08.0pustular, PyodermaBillable
- R21rose, Rash and other nonspecific skin eruptionBillable
- A38.9scarlet, Scarlet fever, uncomplicatedBillable
- T80.69serum, Other serum reaction due to other serumHeader
- K14.1wandering tongue, Geographic tongueBillable
Excludes1
Excludes1 means these codes are not reported together.
- specified type of rash- code to condition
- R23.8Vesicular eruption
Related conditions
Related pages
- R21 code detailsNotes, nearby codes, CMS-HCC group
- Chapter 18Symptoms, signs and abnormal clinical findings
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Rash?
The ICD-10-CM index points "Rash" to R21, Rash and other nonspecific skin eruption. R21 is a billable code.
Is R21 billable?
Yes. R21 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to R21?
The CDC tabular list gives 2 Excludes1 notes (not coded together) for R21 and the categories above it. They are listed on this page.
What chapter is R21 in?
Chapter 18. Symptoms, signs and abnormal clinical findings.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.