R21 ICD-10-CM Code: Rash and other nonspecific skin eruption
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
R21Rash and other nonspecific skin eruption
ICD-10-CM diagnosis code · United States clinical modification
Where R21 sits
- 1
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
- 2
Section
Symptoms and signs involving the skin and subcutaneous tissue (R20-R23)
- 3
Category R21
Rash and other nonspecific skin eruption
- 4
Code R21
Rash and other nonspecific skin eruption
Notes for this code
Inclusion terms
No inclusion terms are listed for R21.
Code first
No “code first” instruction is listed for R21.
Use additional code
No “use additional code” instruction is listed for R21.
Excludes1
Conditions that should not be reported together with this code.
- specified type of rash- code to condition
- vesicular eruption (R23.8)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for R21.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code R21 mean?
R21 is the FY 2027 U.S. ICD-10-CM code for “Rash and other nonspecific skin eruption.”
Is R21 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, R21 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is R21 located in ICD-10-CM?
R21 is listed in Chapter 18, Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), within Symptoms and signs involving the skin and subcutaneous tissue (R20-R23) (R20–R23), under category R21, Rash and other nonspecific skin eruption.
What coding notes are listed for R21?
No inclusion terms are listed for R21 in this reference record. No code-first instruction is listed. Excludes1 notes: specified type of rash- code to condition; vesicular eruption (R23.8). No Excludes2 note is listed.