noun
Medical department specializing in kidney diseases; used in hospital and clinical contexts.
父は腎臓内科で透析を受けている。
My father is receiving dialysis in the nephrology department.
泌尿器科 is urology, which deals with the urinary tract system broadly, while 腎臓内科 is specifically nephrology focusing on kidney diseases.
Compound of 腎臓 (kidney) and 内科 (internal medicine).