In work time?
I am line manager to a woman with multiple health issues, although it's not clear what they are. Most of the time she's a model employee, but she does have a lot of time off for appointments.
She's also very clear that her health is her business and won't share any details. So for example, when she provides an appointment letter (our standard policy) she will black out all the detail of what the appointment is actually for.
I've taken this at face value - her health her business and allowed the time off based on these redacted letters. My boss is now saying I should be insisting on knowing what they're for.