Using the ICD-10 book, assign the proper diagnosis code to the following: Case Study 9
Hospital Admission Note
This 46-year-old female is being admitted today for IV antibiotic therapy because she has been treated for acute pyelonephritis for the last 10 days with no improvement in her symptoms. She is experiencing chills, fever, and flank pain and nausea. I have scheduled an ultrasound to determine if the kidney is enlarged. I will return to see her later today following the results of the ultrasound.

A) N10.0
B) N11.1
C) N12.2
D) N13.3