Hi Anthony,
Normally, my answer would be the same as the one given by Bryan. The simplest path in most multi-location business scenarios is to have 1 page per city and 1 page per service, rather than trying to cover every possible geo/keyword combo. However, most people ask about this before they have invested so much time and money in the development of the site and its content.
Because you've already made the investment, this is what I would suggest you evaluate with the decision makers at the practice:
Is the content simply mediocre or is it actually duplicate content?
If the former, can you envision a way to take these pages to a new level of usefulness? For example, what if, on these pages you currently have, you showcased all of the free or inexpensive auxiliary local resources for mental health? I'm thinking of group therapy, mental health department, serene places to walk for meditation, free yoga or tai chi resources, elder advocacy groups, healthy and fun things for children, lectures, seminars, outdoor concerts, community gardens, pet shelters and anything else you could think of that could make a meaningful difference in patients' mind and body health. Because you would be doing this based on the symptoms of certain conditions and the resources of a given city, each page would, by its very nature, be unique and helpful. You would have, in fact, greatly enhanced the hyperlocal value of each page.
But, if the content is duplicative, that's another matter as it could really be hurting the business and not doing much for the practice's clients. You might, in this case, decide to dismantle a structure that probably shouldn't have been built in the first place and go with the 1 page per city/ 1 page per service model, perhaps even implementing some of the hyperlocal suggestions I've brainstormed to improve the city pages, the health condition pages or both. You could cull the duplicate pages for their best work, build fewer, much better pages instead using some of the old work and greatly adding to it and end up with a very strong but slimmer site.
I think either path is viable, depending on the resources available to you. Hope this helps!