W85 Exposure to electric transmission lines

ICD-10-CM Code W85: Exposure to Electric Transmission Lines

ICD-10-CM code W85 denotes exposure to electric transmission lines. The concept includes specific extensions for initial, subsequent, and sequela encounters. Public health sources discuss electric and magnetic fields from these lines as a possible human carcinogen and note their presence in occupational and residential environments. This reference outlines code structure and source context. 1 4 5

Plain-language overview

Code W85 identifies an instance of exposure to electric transmission lines, and public health literature indicates that such lines are a source of electric and magnetic fields found in both residential and occupational environments. 1 2 4

What this code represents

The semantic type assigned to the W85.XXXD extension is Injury or Poisoning, and the code extensions include W85.XXXA for an initial encounter, W85.XXXD for a subsequent encounter, and W85.XXXS for sequela. 4 5

Documentation considerations

The available code listings provide the alphanumeric extensions for initial, subsequent, and sequela encounters, but the sources do not provide specific clinical documentation rules regarding active care, follow-up care, or residual sequela. 4 5

Clinical context

Public health agencies have faced difficult decisions regarding the management of high-voltage transmission lines because extremely low frequency electric and magnetic fields were declared a possible human carcinogen based on limited epidemiologic evidence. 1

Residential exposures related to power lines and the occurrence of childhood cancer have been the principal public concern driving broader inquiries into extremely-low-frequency electric and magnetic field exposure. 2

Coverage and utilization context

The World Health Organization recommends implementing very low-cost precautionary procedures to reduce exposures to electric and magnetic fields, provided that the health, social, and economic benefits of electric power are not compromised. 1

What the sources add

While the code hierarchy defines specific encounter extensions for transmission line exposure, the public health literature focuses on the physical characteristics of power lines and their measured magnetic fields rather than coding operations. 2 4

The public health sources discuss worker health protection and occupational exposures near electrical equipment, whereas the terminology sources define the specific semantic type and encounter extensions for the W85 code. 3 5

Sources

1. Possible Health Benefits From Reducing Occupational Magnetic Fields — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
3. EMF IN THE WORKPLACE — stacks.cdc.gov; accessed 2026-07-25.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.
5. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.