If you took any distributions from your Health Savings Account (HSA) during the year, then your HSA account administratorwould issue the Form 1099-SA.
If you did not take any money out of the account, then you wouldn’t be receiving a form for 2017. If you have online access to your HSA account, you may be able to access the Form 1099-SA through that account.
If you are not sure who the account administrator is, contact your employer or insurance provider.