ICD-10-CM · L40.0
ICD-10 L40.0: Psoriasis vulgaris
Plaque psoriasis. Most common psoriasis subtype.
Code
L40.0
Category
Diseases of the skin and subcutaneous tissue (L00-L99)
Clinical context
Plaque psoriasis. Most common psoriasis subtype.
Documentation requirements
- BSA (body surface area) %
- PASI score if biologic considered
- Failed topical / phototherapy
Common related procedures
- 99214 E&M
- 96910 phototherapy
Common payer denial patterns
- Biologic (Humira, Stelara, Cosentyx) requires ≥10% BSA OR significant impact + topical failures
Frequently asked questions
What does ICD-10 L40.0 mean?
Psoriasis vulgaris
When is this code documented?
Plaque psoriasis. Most common psoriasis subtype.
What documentation supports this code?
BSA (body surface area) %; PASI score if biologic considered; Failed topical / phototherapy.
What are common denials associated with this diagnosis?
Biologic (Humira, Stelara, Cosentyx) requires ≥10% BSA OR significant impact + topical failures.
Related diagnoses
Sources
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