Just be sure that
You have a good insurance deal, one that include med evac in case of need.
In the Puerto Plata Area the Bouringal Clinic is probably one of the best options. I do think that Dr Redondo is an alternative.
From there, Santiago, where, depending on what your conditions is, you could go to any of four good places, including Corominas, Centro Medico Cibao or Union Medica.. They are all close together.
If you need a list of specialists for your particular problem, send me an email or a PM and I'll look them up.
HB