N13.3Other and unspecified hydronephrosis

N13.3 is the ICD-10-CM diagnosis code for other and unspecified hydronephrosis. It belongs to category N13 (obstructive and reflux uropathy), block N10-N16 (renal tubulo-interstitial diseases) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within N13, choose N13.3 (Other and unspecified hydronephrosis) only when documentation doesn't support a more specific option: hydronephrosis with ureteropelvic junction obstruction (N13.0), hydronephrosis with ureteral stricture, not elsewhere classified (N13.1), hydronephrosis with renal and ureteral calculous obstruction (N13.2), hydroureter (N13.4), Crossing vessel and stricture of ureter without hydronephrosis (N13.5), Pyonephrosis (N13.6), Vesicoureteral-reflux (N13.7), other obstructive and reflux uropathy (N13.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: N13.30 (hydronephrosis) and N13.39 (hydronephrosis).

Don't report N13.3 together with the conditions in its Excludes1 note: hydronephrosis with infection (N13.6).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.