ICD-10-CM 2027
ICD-10 code for Pyonephrosis
From the official ICD-10-CM alphabetic index entry “Pyonephrosis”. Page updated September 29, 2026.
About coding Pyonephrosis
The ICD-10-CM code for Pyonephrosis is N13.6 (Pyonephrosis). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on N13.6.
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.
More specific Pyonephrosis codes (official index)
- tuberculous A18.11 — Tuberculosis of kidney and ureter
Common questions about Pyonephrosis ICD-10 codes
What is the ICD-10 code for Pyonephrosis?
- N13.6 — Pyonephrosis. More specific codes apply when the documentation supports them: A18.11.
What is the ICD-10 code for tuberculous pyonephrosis?
- A18.11 — Tuberculosis of kidney and ureter.
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.