Patient with flank pain was admitted and found to have a calculus of the kidney. A ureteroscopy with placement of bilateral ureteral stents was performed to expand the lumen so the stone could pass naturally. Assign the correct ICD-10-CM/PCS diagnosis and procedure codes.

a. N20.0, N23, 0T788DZ
b. N23, N20.0, 0TC68ZZ, 0TC78ZZ
c. N20.0, 0T768DZ, 0T778DZ
d. N20.0, 0T788DZ