L70.4Infantile acne

L70.4 is the ICD-10-CM diagnosis code for infantile acne. It belongs to category L70 (acne), block L60-L75 (disorders of skin appendages) 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 L70 (acne), L70.4 is specifically for infantile acne. Related codes cover vulgaris (L70.0), conglobata (L70.1), varioliformis (L70.2), tropica (L70.3), excoriee (L70.5), other acne (L70.8) and unspecified (L70.9).

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.

The Medicare Code Editor expects this diagnosis only for patients age 0 through 17; other ages trigger an age-conflict edit.

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 706.1 (other acne).