Go to
www.aanac.org they have an online certification program for MDS coordinators. Very intensive, very good, plus you can join AANAC and have a good resource of information from MDS coordinators throughout the country along with experts in the field.
I have two credentials one through AANAC and one through NASPAC, I am letting the NASPAC expire because of the fact that I have to attend a "live" seminar to renew. AANAC lets you renew online with continuing education courses through their online university. Check it out!