Nearly 44% of office-based physicians used electronic health records in 2009, according to preliminary estimates by the Centers for Disease Control and Prevention. That's up from about 42% in 2008 and 35% in 2007. About 20% of office-based physicians reported having a "basic" EHR system, including patient demographic information, problem lists, clinical notes, prescription orders, and viewing of lab and imaging results. Just over 6% reported having "fully functional" systems, which also send prescription and test orders; highlight out-of-range test levels; and provide patient medical history and follow-up information, drug interaction warnings, and reminders for guideline-based interventions. The data is from the CDC's 2008 National Ambulatory Medical Care Survey and a supplementary mail survey conducted in 2008 and 2009. Data from the 2009 NAMCS will be combined with the mail survey to obtain a final 2009 estimate.