No, it's not. First off, you won't get any information from your spouse's therapist because the therapist is not allowed to share anything with you. You won't even get a call back from them, because the therapist is also not allowed to acknowledge the fact that they are seeing your spouse.

That being said, I don't know who in the right mind would appreciate their spouse contacting their therapist. If the spouse takes a huge issue with that, I wouldn't blame them.