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ICD-10-CM 2027

ICD-10 code for hydroureter

N13.4

Hydroureter

✓ Billable / specificCC — complication/comorbidity

From the official ICD-10-CM alphabetic index entry “Hydroureter”. Page updated September 29, 2026.

About coding hydroureter

The ICD-10-CM code for hydroureter is N13.4 (Hydroureter). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N13.4.

Within N13 (obstructive and reflux uropathy), N13.4 is specifically for hydroureter. 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), 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.

Don't report N13.4 together with the conditions in its Excludes1 note: congenital hydroureter (Q62.3-), hydroureter with infection (N13.6) and vesicoureteral-reflux with hydroureter (N13.73-).

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 hydroureter codes (official index)

  • with infection N13.6 — Pyonephrosis
  • congenital Q62.39 — Other obstructive defects of renal pelvis and ureter

Don't confuse with (Excludes1 for N13.4)

  • congenital hydroureter (Q62.3-)
  • hydroureter with infection (N13.6)
  • vesicoureteral-reflux with hydroureter (N13.73-)

Common questions about hydroureter ICD-10 codes

What is the ICD-10 code for hydroureter?

N13.4 — Hydroureter. More specific codes apply when the documentation supports them: N13.6, Q62.39.

What is the ICD-10 code for congenital hydroureter?

Q62.39 — Other obstructive defects of renal pelvis and ureter.

Is N13.4 billable?

Yes. N13.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N13.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N13.4 as a principal diagnosis.

Is N13.4 a CC or MCC?

N13.4 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.