ICD-10 code for epidermal thickening

The ICD-10-CM code for epidermal thickening is L85.9 (Epidermal thickening, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on L85.9.

Within L85, choose L85.9 (Epidermal thickening, unspecified) only when documentation doesn't support a more specific option: acquired ichthyosis (L85.0), acquired keratosis [keratoderma] palmaris et plantaris (L85.1), keratosis punctata (palmaris et plantaris) (L85.2), xerosis cutis (L85.3) and other specified epidermal thickening (L85.8).

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 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.