R21 - Rash or other non-specific skin eruption

International Classification of Diseases

Last updated: 10/3/2025

What is a ICD-10 Code?

ICD-10 (International Classification of Diseases, 10th Revision) codes are used to classify and code all diagnoses, symptoms, and procedures recorded in association with hospital care. These codes provide a standardized way to track health conditions and their treatment outcomes.

Detailed Description

This code is used when a patient has a rash or other skin eruption that cannot be classified into a more specific category. It covers various types of skin reactions, bumps, or changes in skin appearance where the exact cause or specific type of rash has not been determined or doesn't fit into other specific diagnostic categories.

Additional Information

This is a non-specific diagnostic code used when skin symptoms are present but don't meet criteria for more specific rash diagnoses. Further testing or specialist evaluation may be needed to determine the exact cause.

Category

Symptoms, signs and abnormal clinical and laboratory findings

Medical Specialty

Dermatology, Primary Care

Expected Costs

Your actual cost will depend on your insurance coverage, provider location, and specific circumstances.

What to Expect After

  • Monitor skin changes
  • Follow up with healthcare provider if rash worsens or persists
  • Possible referral to dermatologist for further evaluation if needed

Why Understanding This Code Matters

On Your Medical Bill

This code appears on your medical bills to identify the specific service, procedure, drug, or medical diagnosis you received. Understanding what it means helps you verify you're being charged correctly and know what to expect.

For Your Health

Knowing what this code represents helps you understand your treatment plan, ask better questions during appointments, and track your healthcare journey more effectively.

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