The following table was kindly supplied by NHSDigital in September 2016 in response to a request from me. It shows the total numbers of UK patients diagnosed annually with hypopituitarism (coded as E230) from any cause between 2007 and 2015. According to NHSDigital the figures for Out-Patient Care are less reliable than for Admitted Patient Care.

Looking only at Admitted Patient Care, it is encouraging that the number of finished consultant episodes where hypopituitarism is recorded as any diagnosis (i.e. not just as the primary diagnosis but, for example, as an extra condition diagnosed while the patient is in hospital) has more than doubled during these past 8 years, increasing from 6,243 to 13,677.