noun
nephrologist
A medical doctor specializing in kidney diseases and conditions.
腎臓専門医に診てもらったほうがいいですよ。
You should see a nephrologist.
泌尿器科医 is a urologist, who treats the entire urinary tract and male reproductive system, while 腎臓専門医 focuses specifically on kidney diseases.
Compound of 腎臓 (kidney) + 専門 (specialty) + 医 (doctor).