21st Century Cures Act
The 21st Century Cures Act is a 2016 US law whose ONC Final Rule (2020) prohibits 'information blocking' — practices that interfere with the access, exchange, or use of electronic health information — and requires certified health IT to expose a standardized, FHIR-based API 'without special effort.' It is the legal force behind US healthcare API interoperability: it made patient and population access to health data over HL7 FHIR, US Core, and SMART on FHIR a compliance obligation rather than a voluntary feature.
Regions
Industries
Each links to that industry as a scored cohort — so the question "how ready is this sector for the regime that governs it?" becomes one you can actually look at.
Implemented by these standards
A regulation is the law; a standard is the machine-readable contract that satisfies it. Almost every regime in this catalog restricts an interface rather than requiring one — where a standard exists, it is the part a provider can actually publish.