L13.0Dermatitis herpetiformis

L13.0 is the ICD-10-CM diagnosis code for dermatitis herpetiformis. It belongs to category L13 (other bullous disorders), block L10-L14 (bullous disorders) and chapter 12 (diseases of the skin and subcutaneous tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within L13 (other bullous disorders), L13.0 is specifically for dermatitis herpetiformis. Related codes cover Subcorneal pustular dermatitis (L13.1), other specified bullous disorders (L13.8) and bullous disorder, unspecified (L13.9).

Don't report L13.0 together with the conditions in its Excludes1 note: juvenile dermatitis herpetiformis (L12.2) and senile dermatitis herpetiformis (L12.0).

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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 694.0 (dermatitis herpetiformis).