U.S. ICD-10-CM · FY 2027

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.

Code definition

Official description

R21

Rash and other nonspecific skin eruption

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where R21 sits

  1. 1

    Chapter 18

    Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)

  2. 2

    Section

    Symptoms and signs involving the skin and subcutaneous tissue (R20-R23)

  3. 3

    Category R21

    Rash and other nonspecific skin eruption

  4. 4

    Code R21

    Rash and other nonspecific skin eruption

Documentation details

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.

Transparency

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.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

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.

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