The list of medical conditions that give entitlement to apply for a National Health Service prescription charge medical exemption certificate are:
- a permanent fistula (including caecostomy, colostomy, laryngostomy, or ileostomy) which requires continuous surgical dressing or requires an appliance forms of hypoadrenalism (including Addison's disease) for which specific substitution therapy is essential;
- diabetes insipidus or other forms of hypopituitarism;
- diabetes mellitus (except where treatment of the diabetes is by diet alone);
- myasthenia gravis;
- myxoedema (that is, hypothyroidism requiring thyroid hormone replacement);
- epilepsy requiring continuous anti-convulsive therapy;
- continuing physical disability which prevents the patient from leaving his residence without the help of another person; and
- patients undergoing treatment for cancer, the effects of cancer or the effects of current or previous cancer treatment. (From 1 April 2009).
Clinical advice from NHS England is that the majority of these conditions are considered to be permanent, incurable conditions. Only in exceptional cases would a person have the possibility of curative treatment for one of these conditions.