Rash and other nonspecific skin eruption (R21) ICD-10-CM
The R21 code range covers rash and other nonspecific skin eruption with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- rash NOS
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- specified type of rash- code to condition
- vesicular eruption R23.8
Codes in the R21 Range 1 codes · 1 billable
- R21 Rash and other nonspecific skin eruption
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the R21 range.
Exanthema
Diseases in which skin eruptions or rashes are a prominent manifestation. Classically, six such diseases were described with similar rashes; they were numbered in the order in which they were reported. Only the fourth (Duke's disease), fifth (ERYTHEMA INFECTIOSUM), and sixth (EXANTHEMA SUBITUM) numeric designations survive as occasional synonyms in current terminology.
About the R21 Code Range
Rashes and other nonspecific skin eruptions are grouped with symptoms and signs involving the skin and the tissue beneath it.
R21 has no subdivisions in this category. Exanthema describes diseases in which a rash or skin eruption is a prominent feature.
Questions About This Page
How many billable codes are in the R21 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the R21 range classify?
The range classifies rash and other nonspecific skin eruption. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
