ICD-10-CM 2027
ICD-10 code for heat dermatitis
From the official ICD-10-CM alphabetic index entry “Dermatitis (eczematous) › heat”. Page updated September 29, 2026.
About coding heat dermatitis
The ICD-10-CM code for heat dermatitis is L59.0 (Erythema ab igne [dermatitis ab igne]).
Within L59 (other disorders of skin and subcutaneous tissue related to radiation), L59.0 is specifically for erythema ab igne [dermatitis ab igne]. Related codes cover other specified disorders of the skin and subcutaneous tissue related to radiation (L59.8) and disorder of the skin and subcutaneous tissue related to radiation, unspecified (L59.9).
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.
Common questions about heat dermatitis ICD-10 codes
What is the ICD-10 code for heat dermatitis?
- L59.0 — Erythema ab igne [dermatitis ab igne].
Is L59.0 billable?
- Yes. L59.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L59.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L59.0 as a principal diagnosis.
Is L59.0 a CC or MCC?
- No. L59.0 is neither a CC nor an MCC under MS-DRG v44.0.