Bit confused.
Are you interested in health psychology or PTSD research? They aren't mutually exclusive if you want to look at health behaviors among PTSD, but if your area of interest is actually PTSD - that isn't really health psych.
If you are interested in health psych - yes, look for programs with tracks, but to the best of my knowledge there is no "certification" for health psychology, thus I doubt it makes a big difference.
For example, we have lots of health psych researchers here and I'm in a very well-known health psychology lab, but no formal track. I don't expect to have any difficulties, and in fact am in a MUCH better position to set up my career than I would if I had gone to say <insert random professional school> that may have had a health psych track, but no particularly large health psych labs.
I guess what I'm getting at is, coursework in grad school is pretty meaningless. Concentrations are generally based off coursework. If you can get one, great, since more courses relevant to your area is obviously better, but I would never pass up the opportunity to work in a great lab for a school that offered a coursework-based concentration.