ICD-10 code for localized skin mass

The ICD-10-CM code for localized skin mass is R22.9 (Localized swelling, mass and lump, unspecified). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R22.9.

Within R22, choose R22.9 (unspecified) only when documentation doesn't support a more specific option: head (R22.0), neck (R22.1), trunk (R22.2), upper limb (R22.3) and lower limb (R22.4).

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.