R21
R21: Rash and other nonspecific skin eruption
Billable / specific codeICD-10-CM
R21 is a billable, specific ICD-10-CM code for rash and other nonspecific skin eruption. It is valid for submission on a claim.
Check R21 with the rest of the claim: free scrubberExcludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- specified type of rash- code to condition
- vesicular eruption (R23.8)
Includes
Conditions this code covers.
- rash NOS
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
R21 is named in 18 Medicare coverage policies: 18 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A55326Billing and Coding: Zika Virus Testing by PCR and ELISA Methods
- A56587Billing and Coding: Cosmetic and Reconstructive Surgery
- A56658Billing and Coding: Cosmetic and Reconstructive Surgery
- A56837Billing and Coding: Reduction Mammaplasty
Alphabetic index entries that lead here
- Rash(toxic)
- Eruption›skin(nonspecific)
- Rash›rose
- Rose›rash
Code history
Unchanged in every release from FY2024 to FY2027.