open source blockchain framework

See the following -

Change Healthcare Introduces Enterprise Blockchain for Healthcare

Press Release | Change Healthcare | September 25, 2017

Change Healthcare today announced the launch of the first blockchain solution for enterprise-scale use in healthcare, enabling payers and providers to boost revenue cycle efficiency, improve real-time analytics, cut costs, and create innovative new services. As one of the largest independent healthcare IT companies in the United States, Change Healthcare services customers across the continuum of care, using its Intelligent Healthcare Network™ to process 12 billion healthcare-related transactions covering over $2.0 trillion in claims annually...