This is a hard space to be in. I am glad ycombinator is funding startups like this. To survive in this space you need to be profitable early on and it looks like you guys are already focusing on that business wise.

The challenge for your business is the various Emr/EHR systems that you have to pull data from. Some of these vendors might not be so friendly, has data lock in is a business strategy. Some systems might not have HL7 or some other type of known integration; the interfaces could be proprietary. Some systems might use their own custom database. Getting out EHR data even in known databases (MySQL , SQL server, etc) could be challenging if integration doesn't work and you have figure out the schema mapping, as the vendor has no incentive to give you the schema.

I am not sure your one price fits all can work well. It seems like it would work for known systems you know you get data accurately out of. What about all those one off deeply proprietary systems; it might take allot more time. I guess getting EHR printouts and manually entering in data is one strategy, but it's quite error prone. Accuracy means everything here. On top of that some of these doctors might not have any incentives to let your team figure out how to pull data from their system.

I know this because I use to do data migrations for a top EMR company. Medical records migrations are considered the most complex.

I would also add that how would your customers know you won't lock in their data. Will you publish your data format?