I'm not sure. I used the service in the past and I'm considering using it again. Picnic Health is really great if you're seeing a lot of different doctors over a short period of time or you have a health issue that involves coordination of a lot of records. It's really a pain to deal with different offices to get your medical records exchanged.
However, I was surprised when I used it last. They were able to find doctors that I didn't report. Turns out a lot of doctors are part of networks in geographical areas that allow sharing of medical records. They might've also used my insurance provider. If you see doctors with insurance, the insurance company will also have a record.
I don't think doctors are required to report patient records to a central authority. The government is able to access medical records without a warrant though. They might have a centralized way of knowing which doctors a person has visited.
However, I was surprised when I used it last. They were able to find doctors that I didn't report. Turns out a lot of doctors are part of networks in geographical areas that allow sharing of medical records. They might've also used my insurance provider. If you see doctors with insurance, the insurance company will also have a record.
I don't think doctors are required to report patient records to a central authority. The government is able to access medical records without a warrant though. They might have a centralized way of knowing which doctors a person has visited.