N13.0 — Hydronephrosis with ureteropelvic junction obstruction
N13.0 is a billable, specific ICD-10-CM code for hydronephrosis with ureteropelvic junction obstruction. It is valid for submission on a claim.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- Hydronephrosis with ureteropelvic junction obstruction due to calculus (N13.2)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Hydronephrosis due to acquired occlusion of ureteropelvic junction
Risk adjustment
N13.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
N13.0 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A55336Billing and Coding: Retroperitoneal Ultrasound
- A57455Billing and Coding: Urodynamics
How N13.0 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to N13.0.
- Hydronephrosis NEC›congenital›due to acquired occlusion of ureteropelvic junction
- Obstruction, obstructed, obstructive›pelviureteral junction›with hydronephrosis
- Stricture›pelviureteric junction›acquired, with hydronephrosis
- Stricture›ureteropelvic junction›acquired, with hydronephrosis
- Hydronephrosis NEC›with›obstruction›ureteropelvic junction›acquired
Related codes at this level
Codes that share N13. If N13.0 is not quite right, the correct code is usually one of these.
- N13.1Hydronephrosis with ureteral stricture, not elsewhere classified
- N13.2Hydronephrosis with renal and ureteral calculous obstruction
- N13.3Other and unspecified hydronephrosis
- N13.4Hydroureter
- N13.5Crossing vessel and stricture of ureter without hydronephrosis
- N13.6Pyonephrosis
- N13.7Vesicoureteral-reflux
- N13.8Other obstructive and reflux uropathy
- N13.9Obstructive and reflux uropathy, unspecified
Questions about N13.0
- Is N13.0 a billable ICD-10-CM code?
- Yes. N13.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does N13.0 sit in the tabular list?
- Diseases of the genitourinary system (N00-N99), in the block Renal tubulo-interstitial diseases (N10-N16).