Final casualty figures are not known but several staff and patients are confirmed dead and more seriously injured. MSF's most recent numbers are 12 staff members and at least 7 patients killed; 37 people injured including 19 staff members.
http://www.aljazeera.com/news/2015/10/aid-workers-killed-air-strike-afghan-hospital-kunduz-151003043052500.html
http://www.doctorswithoutborders.org/article/afghanistan-msf-staff-killed-hospital-partially-destroyed-kunduz
http://www.theguardian.com/world/2015/oct/03/kunduz-charity-hospital-bombing-violates-international-law
http://www.aljazeera.com/news/2015/10/aid-workers-killed-air-strike-afghan-hospital-kunduz-151003043052500.html
http://www.doctorswithoutborders.org/article/afghanistan-msf-staff-killed-hospital-partially-destroyed-kunduz
http://www.theguardian.com/world/2015/oct/03/kunduz-charity-hospital-bombing-violates-international-law