ICD-10-CM 2027
ICD-10 code for psoriasis
Confirmed by the official ICD-10-CM index entry “psoriasis”. Page updated September 29, 2026.
About coding psoriasis
The ICD-10-CM code for psoriasis is L40.9 (Psoriasis, unspecified). The official index lists 12 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L40.9.
Within L40, choose L40.9 (unspecified) only when documentation doesn't support a more specific option: vulgaris (L40.0), generalized pustular psoriasis (L40.1), acrodermatitis continua (L40.2), Pustulosis palmaris et plantaris (L40.3), Guttate psoriasis (L40.4), Arthropathic psoriasis (L40.5) and other psoriasis (L40.8).
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 595 (Major Skin Disorders with MCC, relative weight 2.0239) and DRG 596 (Major Skin Disorders without MCC, relative weight 1.1071), 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.
Related Psoriasis codes
- L40.0 Psoriasis vulgaris
- L40.1 Generalized pustular psoriasis
- L40.2 Acrodermatitis continua
- L40.3 Pustulosis palmaris et plantaris
- L40.4 Guttate psoriasis
- L40.50 Arthropathic psoriasis, unspecified
- L40.51 Distal interphalangeal psoriatic arthropathy
- L40.52 Psoriatic arthritis mutilans
- L40.53 Psoriatic spondylitis
- L40.54 Psoriatic juvenile arthropathy
- L40.59 Other psoriatic arthropathy
- L40.8 Other psoriasis
Common questions about psoriasis ICD-10 codes
What is the ICD-10 code for psoriasis?
- L40.9 — Psoriasis, unspecified. More specific codes apply when the documentation supports them: L40.0, L40.1, L40.2, L40.3 and others below.
What is the ICD-10 code for psoriasis vulgaris?
- L40.0 — Psoriasis vulgaris.
What is the ICD-10 code for generalized pustular psoriasis?
- L40.1 — Generalized pustular psoriasis.
What is the ICD-10 code for acrodermatitis continua?
- L40.2 — Acrodermatitis continua.
What is the ICD-10 code for pustulosis palmaris et plantaris?
- L40.3 — Pustulosis palmaris et plantaris.
What is the ICD-10 code for guttate psoriasis?
- L40.4 — Guttate psoriasis.
What is the ICD-10 code for arthropathic psoriasis, unspecified?
- L40.50 — Arthropathic psoriasis, unspecified.
Is L40.9 billable?
- Yes. L40.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L40.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L40.9 as a principal diagnosis.
Is L40.9 a CC or MCC?
- No. L40.9 is neither a CC nor an MCC under MS-DRG v44.0.