I have been seeing the same attending physician for the last 9 years.
Dr. XX has been my primary care-giver for the last 9 years.
この場合、次のような言い方ができますよ。
ーI have been seeing the same attending physician for the last 9 years.
「この9年間、同じ主治医に診てもらっている」
to see the same attending physician で「同じ主治医に診てもらう」
ーDr. XX has been my primary care-giver for the last 9 years.
「XX医師はこの9年間、私の主治医です」
ご参考まで！
カナダ 
