Ties, AFAIK the degree of disclosure has been driven by HR and my employees' MHP team. Full disclosure to the reintegration team manager was negotiated before I even came onto the scene, as far as I'm aware.
What I do know for certain is that our HR rep was quite insistent upon certain points being shared with me at the briefing I attended.
And, yes, I see why you would say this. It's one of the reasons I've posted on here - I'd be very uncomfortable, too, if this were myself. As a manager, I'm used to being privy to information about my employees' health in the sense that I know that someone is unable to come to work and roughly why this is. And then, of course, there's the obvious stuff (someone being on crutches) and the social chatter stuff (everyone's favourite colleague, who seems to positively enjoy sharing how many times exactly they dashed to the loo a night due to their Norovirus infection ... ewwwww!).
Necessary, of course, is debatable. Is it helpful to me to know that I'm not employing someone who quite simply can't be arsed to turn up on time? Sure! Is it necessary for me to know that there is a good reason? Probably - like any half-decent boss, I'd otherwise feel that it's something I'd have to actively performance manage for my employee's sake as well as for my own. Is it necessary for me to know any specifics of this reason? Possibly not! I would, naturally, be wondering (as I like to say, bosses are only human, too) - and seeing as I'm not completely thick and capable of googling, and seeing my employee displays some rather obvious symptoms of his condition, I'd probably work it out, feel it wasn't my place to say anything, and quietly make a few mental adjustments regarding my own expectations of them.
Insofar: brilliant point! Having given this some thought, I actually agree that I may have been somewhat over-informed (though, in my defence, I didn't have a say in how much I was told).
OTOH, given that I'm under instructions to take an employee's work tools away at the end of the day and alert HR if I think they're not quite ready to return, I kind of do expect my employer to give me an explanation as to why they would ask me to do things that I would never ordinarily consider appropriate. I might be a manager to my employees but I see my role as a servant-leader one; my job, in my opinion, mainly consists of bringing about the conditions under which they can achieve their true potential and shine. I usually have zero patience for bossess who micromanage their staff in any sort of way - that's pretty much my personal definition of 'poor manager'.
So, TBH, I don't really know at all how this situation should be handled ideally. I get why you'd find it intrusive and actually had that thought before you brought it up. I also get that managers being asked to do specific things as pertaining to particular employees have a need to know why - and that managers are employees, too, usually.
Thanks a million for the input, though. I'll have to give this some very serious thought and try and think of a solution (regarding future disclosures) that does all sides as much justice as humanly possible.