With 10,000 deliveries and thousands of abortions, 21 law suits maybe entirely within normal range for an obgyn.
Obgyns who deliver babies are sued an average of 2 to 3 times (2.53 to be exact, but it is hard to be sued .53 times) over their carreers: http://www.medicinenet.com/script/main/art.asp?articlekey=51348 Doesn’t sound like much, but these account for 25% of all malpractice payouts. (Same link.)
21 times is WAY outside the norm...