If you just paid for service - you do not need to issue 1099misc form.
Let me know if you need nay help.
You do not have to issue a Form 1099-MISC since you are not making this payment in the ordinary course of your business.
It also does not affect your ability to take medical deduction. You can deduct the medical expenses you pay for treatment of your son to the therapist and of course the deduction will be subject to 7.5% AGI floor.
Let me know if you have any question.
Please note: This advice is provided with the understanding that all the relevant facts have been provided by you. Any change in facts might affect the advice given and hence may not be relied on in such cases. Nothing contained in this reply was intended or written to be used, can be used by any taxpayer, or may be relied upon or used by any taxpayer for the purposes of avoiding penalties that may be imposed on the taxpayer under the Internal Revenue Code of 1986, as amended.