---
title: "ICD-10-CM R21: Rash and other nonspecific skin eruption | BillingBrief"
description: "ICD-10-CM code R21: Rash and other nonspecific skin eruption. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/r21/"
language: "en"
---

# R21 Rash and other nonspecific skin eruption

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Rash and other nonspecific skin eruption

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Includes

-   rash NOS

### Excludes1

Not coded together with this code. The exception is when the two conditions are unrelated to each other.

-   specified type of rash- code to condition
-   vesicular eruption (R23.8)

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   symptoms relating to breast (N64.4-N64.5)

## Common questions

### Is R21 a billable code?

Yes. R21 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

R21 Rash and other nonspecific skin eruption

Chapter

Symptoms, signs and abnormal clinical and laboratory findings

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).