The National Institute for Health and Clinical Excellence (NICE) has issued full guidance to the NHS in England, Wales, Scotland and Northern Ireland on Grenz rays therapy for inflammatory skin conditions.

The guidance was considered for reassessment in November 2010 and it was concluded that NICE will not be updating this guidance at this stage. However, if you believe there is new evidence which should warrant a review of our guidance, please contact us via the email address below.


Skin inflammation is associated with conditions such as dermatitis, psoriasis and lichen planus. Grenz rays therapy involves exposing the skin to low-energy, non-penetrative electromagnetic radiation. It is used in several inflammatory skin conditions (including certain localised forms of eczema and psoriasis) when other therapies have failed. These conditions can severely impair quality of life, with effects that include redness, itching and blistering.

Coding recommendations

X65.4 Delivery of fraction of external beam radiotherapy NEC

Y91.3 Superficial or orthovoltage treatment for radiotherapy

Note: A code from Chapter Z would also be recorded to identify the site of the therapy.

In addition an ICD-10 code(s) is assigned for the specific type of inflammatory skin condition being treated, such as eczema or psoriasis.