It's a good idea overall. My suggestion is to absolutely under no circumstances attempt to cover all (or a large number) possible medical codes in the first fe

It's a good idea overall. My suggestion is to absolutely under no circumstances attempt to cover all (or a large number) possible medical codes in the first few years. Do not spend any mental energy on that, it will bury you, it will rob your motivation, it will waste your time and make you wish you never considered the service. Do the opposite, start very stupid simple, knock down one bowling pin. Pick a small selection of the most common medical codes or those most in need of this service (the treatments that can benefit most from this). Roll the complexity gradually from there. You will be aided by resources as you scale, in many ways, which you will lack in the beginning. Your expanding userbase can also assist you immensely as you go along (in the beginning they won't exist); but you first need to have a very useful service to get those users, and to do that you have to be good at something; narrow, narrow, narrow; you'll expand outward later. And frankly if you can't make it work for a small group of medical codes, you are not going to make it work for a much larger & complex context. Again, whatever you do, do not attempt to run before you crawl with this. You don't need to do that. Just offering this for small selection of medical codes could be hugely valuable, then slowly expand it. Make it work super well for that small group first. Make it clear what your service focuses on, and keep that list short. Reject any attempts by users to expand the system to cover all medical codes in the beginning. It's no different than going from Harvard.edu, to Stanford.edu as in the Facebook bowling pin strategy, and then building up some demand from users to see you add more medical codes (the userbase will help inform you which to do next). Do not try to go wide in the beginning, it's a guaranteed path to failure. Plus, if you start with a small selection of medical codes, you can better focus on your outreach / marketing to just those people and their circumstances. It will drastically simplify your attempts to find the first 100 / 1000 / 10000 users, and those early users will all be able to coordinate on the same narrow medical code/s, which will build the initial community foundation you require. If you try to go wide initially, covering a lot of medical codes, you'll get stray users that won't be able to coordinate with the other users who all have different medical codes (ie it's better to have 1,000 users with the same single medical code, than 1,000 medical codes each with one user).