ICD Code L21.9

ICD code L21.9 is seborrheic dermatitis, unspecified, which refers to a skin condition causing red, scaly, and itchy patches, but without further detail about the specific type or location.

1. Presence of erythematous (red), scaly, and greasy patches or plaques on the skin

2. Involvement of typical areas such as the scalp, face (especially nasolabial folds, eyebrows, and eyelids), ears, chest, or upper back

3. Chronic or relapsing course of symptoms

4. Pruritus (itching) may be present but is not always required

5. Absence of secondary infection or other specific dermatologic diagnoses

6. No clear identification of a more specific subtype or cause of the dermatitis

Relevant CPT codes that may be used to treat ICD code L21.9 include:

- 99201–99215 (Evaluation and Management services)

- 11000 (Debridement of extensive eczematous or infected skin; up to 10% of body surface)

- 11001 (Debridement of extensive eczematous or infected skin; each additional 10%)

- 96910 (Phototherapy, ultraviolet B [UVB])

- 96920 (Laser treatment for inflammatory skin disease)

- 96372 (Therapeutic, prophylactic, or diagnostic injection; subcutaneous or intramuscular)

- 11900–11901 (Injection, intralesional; up to and over 7 lesions)

- 99241–99245 (Office consultation for a new or established patient)

CPT code selection should be based on the specific services rendered for the treatment of L21.9.

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