[Avodah] Rav Moshe Feinstein: Choosing A Frum Doctor?

[Prof. Levine]

 From http://revach.net/article.php?id=366

If a person has a choice of two doctors, one of them is Shomer 
Mitzvos but is not a specialist for the particular procedure needed 
and the other doctor is a specialist however he is a Kofer, which one 
is preferable? The Igros Moshe (YD 4:8) says there is no question 
that the latter is preferable unless he is actively involved in 
seducing people away from keeping the Torah and Mitzvos. Otherwise 
since we have an obligation to seek medical help when needed 
according to the Rambam and most Rishonim, included in that 
obligation is the obligation to seek out the best doctor available 
whether he is a Jew or a non-Jew.

However adds Rav Moshe, since it is always possible that any doctor 
may err regardless of his expertise, we must pray to Hashem the true 
healer that the doctor will not blunder and his care will bring a cure.