ICD-10-CM 2027
ICD-10 code for Polymorphous light sun eruption
From the official ICD-10-CM alphabetic index entry “Eruption › polymorphous light (sun)”. Page updated September 29, 2026.
About coding Polymorphous light sun eruption
The ICD-10-CM code for Polymorphous light sun eruption is L56.4 (Polymorphous light eruption).
Within L56 (other acute skin changes due to ultraviolet radiation), L56.4 is specifically for Polymorphous light eruption. Related codes cover drug phototoxic response (L56.0), drug photoallergic response (L56.1), Photocontact dermatitis [berloque dermatitis] (L56.2), solar urticaria (L56.3), disseminated superficial actinic porokeratosis (DSAP) (L56.5), other specified acute skin changes due to ultraviolet radiation (L56.8) and acute skin change due to ultraviolet radiation, unspecified (L56.9).
Use an additional code to identify the source of the ultraviolet radiation (W89, X32).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about Polymorphous light sun eruption ICD-10 codes
What is the ICD-10 code for Polymorphous light sun eruption?
- L56.4 — Polymorphous light eruption.
Is L56.4 billable?
- Yes. L56.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L56.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L56.4 as a principal diagnosis.
Is L56.4 a CC or MCC?
- No. L56.4 is neither a CC nor an MCC under MS-DRG v44.0.