ICD-10-CM 2027
ICD-10 code for Hydropyonephrosis
From the official ICD-10-CM alphabetic index entry “Hydropyonephrosis”. Page updated September 29, 2026.
About coding Hydropyonephrosis
The ICD-10-CM code for Hydropyonephrosis is N13.6 (Pyonephrosis).
Within N13 (obstructive and reflux uropathy), N13.6 is specifically for Pyonephrosis. Related codes cover 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), other and unspecified hydronephrosis (N13.3), hydroureter (N13.4), Crossing vessel and stricture of ureter without hydronephrosis (N13.5), Vesicoureteral-reflux (N13.7), other obstructive and reflux uropathy (N13.8) and 1 more.
Use an additional code (B95-B97), to identify infectious agent.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about Hydropyonephrosis ICD-10 codes
What is the ICD-10 code for Hydropyonephrosis?
- N13.6 — Pyonephrosis.
Is N13.6 billable?
- Yes. N13.6 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N13.6 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N13.6 as a principal diagnosis.
Is N13.6 a CC or MCC?
- N13.6 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.