Investors apparently like the idea of building a company around the concept of helping anesthesiologists track patient billing by mobile phone.

According to a filing with the Securities and Exchange Commission, Medaxion LLC — the company created by HealthStream co-founder Jeff McLaren four years ago — has offered and sold $800,959 of company stock, the third such offering in as many years.

In August 2010, Medaxion first marketed to investors $1.5 million in company stock. That offering brought in $756,702 and it's not clear if McLaren's team raised the remainder at a later time. (McLaren couldn't be reached for comment this week.) In September 2011, a little more than $1 million was offered up and about $660,000 sold.

Medaxion's software lets anesthesiologists on the move track their schedules, case status and billing information via iPhone.