Noting there are over 300 software vendors in the electronic healthcare marketplace with many "market segments (consider: size of practice served, specialties services, inpatient/outpatient) and very 'fuzzy' sources of data here's what one columist surmises:

• There are 788,000 U.S. physicians, 65% of them or 512,000 are outpatient/private practice based, making them, potentially the EHR market (U.S. Bureau of Labor and Statistics); 44% of that number or 225,000 practitioners have adopted either a partial, basic, or fully functional EHR system, according to the CDC

The top vendors in this marketplace are:

• Epic (45,000 ohysicians/ 17% marketshare)
• eClinicalWorks (40,000 physicians / 15% amarketshare)
  
• Allscripts (40,000 physicians / 15% marketshare)
• NextGen (35,000 / 13% marketshare) 
• SOAPWare (30,000 physicians / 12% marketshare)
• GE Centricity (35,000 physicians / 10% marketshare)
• Practice Fusion (18,500 physicians 7% marketshare 
• Other Vendors (10% marketshare)

Chris Thorman, SoftwareAdvise.com writes in "EHR Software Market Share Analysis." Read more: http://www.softwareadvice.com/articles/medical/ehr-software-market-share-analysis-1051410/#ixzz0olbXsl00