The Certified Health IT Product List (CHPL) is a comprehensive and authoritative listing of all certified Health Information Technology which has been successfully tested and certified by the ONC Health IT Certification program. All products listed on the CHPL have been tested by an ONC-Accredited Testing Laboratory (ONC-ATL) and certified by an ONC-Authorized Certification Body (ONC-ACB) to meet criteria adopted by the Secretary of the Department of Health and Human Services (HHS).

This dataset provides the proportion of developers, by market share, that have certified 2015 edition health IT modules. Market share approximations are determined through an analysis of the certified health IT products reported by participants in the Medicare EHR Incentive Program from 2011 to 2016. Approximations use the most recently reported data for each unique clinician and hospital participant. It is important to understand how to interpret these approximations. Some clinicians and hospitals report certified software from more than one unique developer. The market share percentages in this dataset, therefore, include some double counting (the percentages will, if summed together, add up above 100 percent.) The approximations convey the percent of hospitals and clinicians who use a developer's technology, and are not to be interpreted in aggregate as the percent of all hospitals and clinicians who have access to 2015 edition certified technology.

The Medicare Electronic Health Record (EHR) Incentive Program provides incentives to eligible clinicians and hospitals to adopt electronic health records. This dataset combines meaningful use attestations from the Medicare EHR Incentive Program and certified health IT product data from the ONC Certified Health IT Product List (CHPL) to identify the unique vendors, products, and product types of each certified health IT product used to attest to meaningful use. The dataset also includes important provider-specific data, related to the provider's participation and status in the program, unique provider identifiers, and other characteristics unique to each provider, like geography and provider type.