ICD-10-CM 2027
ICD-10 code for herpetiformis impetigo
From the official ICD-10-CM alphabetic index entry “Impetigo (any organism) (any site) (circinate) (contagiosa) (simplex) (vulgaris) › herpetiformis”. Page updated September 29, 2026.
About coding herpetiformis impetigo
The ICD-10-CM code for herpetiformis impetigo 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 herpetiformis impetigo codes (official index)
- nonobstetrical L40.1 — Generalized pustular psoriasis
Common questions about herpetiformis impetigo ICD-10 codes
What is the ICD-10 code for herpetiformis impetigo?
- L40.1 — Generalized pustular psoriasis. More specific codes apply when the documentation supports them: L40.1.
What is the ICD-10 code for nonobstetrical herpetiformis impetigo?
- L40.1 — Generalized pustular psoriasis.
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.