That's really cool. I'll probably end up trying to reproduce this by following your work step-by-step. I'm not too familiar with OSM, besides having used Nominatim.
Along the same lines we're crowdsourcing a database of hospital prices, starting this week. I'm reviewing our first pull request as we speak. You can follow our progress live. The data is here: https://www.dolthub.com/repositories/dolthub/standard-charge...
A limitation of our dataset is it excludes percentage-based contracts. So those won't show up.
Anyways, if you have the hospital NPI you want, you can look up all of its dollar-amount negotiated rates in this table. You can link that to the `hospital` table, geocode however you want, and make a map of the different rates. Note, however, that the insurance data published here is kind of a mess and, I think, contains many many mistakes (originating in the source data.)
BTW, I'm not sure if this insurance-derived hospital data exists anywhere else. I believe it doesn't.
Along the same lines we're crowdsourcing a database of hospital prices, starting this week. I'm reviewing our first pull request as we speak. You can follow our progress live. The data is here: https://www.dolthub.com/repositories/dolthub/standard-charge...
We talked a little about the problems we're encountering here: https://docs.google.com/document/d/1uMx1sUYwP_uE7ebd3PtGvF0t... and here https://docs.google.com/document/d/1NifwgKHBCeF35ZRZsfpgg4bE...