Billable / Specific Code
ICD-10-CM R21 is the diagnosis code for Rash and other nonspecific skin eruption. This code falls under the section "Symptoms and signs involving the skin and subcutaneous tissue" within Chapter 18 — Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as R21. They are mutually exclusive:
Understanding where R21 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, R21 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
R21 is the ICD-10-CM diagnosis code for "Rash and other nonspecific skin eruption". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
R21 is located in Section R20-R23 — "Symptoms and signs involving the skin and subcutaneous tissue" within Chapter 18 of the ICD-10-CM Tabular List.
Use R21 when the patients documented diagnosis matches "Rash and other nonspecific skin eruption" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Rash and other nonspecific skin eruption is R21.
Yes, R21 can be used as a primary diagnosis code since it is billable and specific.
R21 is in Chapter 18 of the ICD-10-CM Tabular List.
Type 1 Excludes for R21 include: specified type of rash- code to condition; vesicular eruption (R23.8).
Yes, R21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.