ICD Code R21-

ICD code R21 is used to indicate "rash and other nonspecific skin eruption."

1. Presence of visible skin eruptions or spots that are not associated with a specific underlying disease

2. Absence of accompanying symptoms such as fever, pain, or systemic illness

3. No evidence of infection, allergic reaction, or chronic dermatologic condition

4. Rash is generalized or localized but not attributable to a more specific diagnosis

5. Patient history and physical examination do not reveal a clear etiology for the rash

6. Laboratory and diagnostic tests are inconclusive or non-diagnostic for a specific cause

Relevant CPT codes that may be used to treat ICD code R21 include:

- 99202–99215 (Evaluation and Management office visits)

- 88305 (Pathology examination of skin biopsy)

- 11102, 11103 (Tangential biopsy of skin)

- 17000, 17003, 17004 (Destruction of premalignant skin lesions)

- 96910 (Phototherapy for skin)

- 96372 (Therapeutic injection, subcutaneous or intramuscular)

- 36415 (Collection of venous blood by venipuncture)

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