ICD-10-CM 2027
ICD-10 code for Nummular psoriasis
From the official ICD-10-CM alphabetic index entry “Psoriasis › nummular”. Page updated September 29, 2026.
About coding Nummular psoriasis
The ICD-10-CM code for Nummular psoriasis is L40.0 (Psoriasis vulgaris).
Within L40 (psoriasis), L40.0 is specifically for psoriasis vulgaris. Related codes cover generalized pustular psoriasis (L40.1), 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 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.
Common questions about Nummular psoriasis ICD-10 codes
What is the ICD-10 code for Nummular psoriasis?
- L40.0 — Psoriasis vulgaris.
Is L40.0 billable?
- Yes. L40.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L40.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L40.0 as a principal diagnosis.
Is L40.0 a CC or MCC?
- No. L40.0 is neither a CC nor an MCC under MS-DRG v44.0.