"... a move that could induce physicians to pay more attention to the condition and spur more insurers to pay for treatments."
The question whether something is a disease is really beside the point, unless you define "disease" to mean: that which is helpful to view as disease.
This reminds me of those plastic surgeons who say that small breasts are a "deformity."
ADDED: Instapundit notes a discussion about a call for more "public health" research on guns and quips "[M]y suggestion to the 'public health' community is to focus on actual diseases, rather than politically-disapproved behaviors." But all you have to do is crank the rhetoric forward one turn and guns are a disease.
AND: I googled "guns are a disease" and got over 29 million hits, including: "Doctors target gun violence as a social disease" and "I am a physician and guns are a disease" and "Treat gun violence like disease, Medical College expert says."