ICD-10-CM 2027
ICD-10 code for pustular generalized psoriasis
From the official ICD-10-CM alphabetic index entry “Psoriasis › pustular (generalized)”. Page updated September 29, 2026.
About coding pustular generalized psoriasis
The ICD-10-CM code for pustular generalized psoriasis is L40.1 (Generalized pustular psoriasis). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on L40.1.
Within L40 (psoriasis), L40.1 is specifically for generalized pustular psoriasis. Related codes cover vulgaris (L40.0), acrodermatitis continua (L40.2), Pustulosis palmaris et plantaris (L40.3), Guttate psoriasis (L40.4), Arthropathic psoriasis (L40.5), other psoriasis (L40.8) and unspecified (L40.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific pustular generalized psoriasis codes (official index)
- palmaris et plantaris L40.3 — Pustulosis palmaris et plantaris
Common questions about pustular generalized psoriasis ICD-10 codes
What is the ICD-10 code for pustular generalized psoriasis?
- L40.1 — Generalized pustular psoriasis. More specific codes apply when the documentation supports them: L40.3.
What is the ICD-10 code for palmaris et plantaris pustular generalized psoriasis?
- L40.3 — Pustulosis palmaris et plantaris.
Is L40.1 billable?
- Yes. L40.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L40.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L40.1 as a principal diagnosis.
Is L40.1 a CC or MCC?
- No. L40.1 is neither a CC nor an MCC under MS-DRG v44.0.