Phillip Bump, Washington Post
"In the blink of an eye, Obamacare enrollment numbers through August fell from 7.3 million to just under 7 million -- a level that dips overall enrollment under 2013 enrollment projections from the Congressional Budget Office. How'd it happen? In short, the administration combined Obamacare medical plan enrollment with dental plan enrollment for those August numbers -- while previous reports had kept the two numbers distinct.
Here's how the Department of Health and Human Services reported enrollments in a report last April. This shows only the last line of enrollments, but the number of plans with data on "metal level" (that is, the quality of the plan), is fairly close to the overall number of enrollments. Underneath, the number of people who got standalone dental coverage. 8 million; 1.1 million."