N13.3 – Other and unspecified hydronephrosis
ICD-10-CM 2027 diagnosis code · Renal tubulo-interstitial diseases
ICD-10-CM code
N13.3
- Code
N13.3(claims format:N133)- Description
- Other and unspecified hydronephrosis
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 14. Diseases of the genitourinary system (N00-N99)
- Block
- N10-N16 Renal tubulo-interstitial diseases
- Parent codes
- N13
Billable codes under N13.3
N13.3 is a header code and cannot be used on claims. Choose the most specific code:
- N13.30 – Unspecified hydronephrosisBillable
- N13.39 – Other hydronephrosisBillable
Notes for N13.3
Excludes1 (not coded here):
- hydronephrosis with infection (N13.6)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
N13 – Obstructive and reflux uropathy
Excludes2 (not included here):
Block N10-N16
Includes:
- pyelonephritis
Excludes1 (not coded here):
- pyeloureteritis cystica (N28.85)
Related codes in N13
- N13.0 – Hydronephrosis with ureteropelvic junction obstructionBillable
- N13.1 – Hydronephrosis with ureteral stricture, not elsewhere classifiedBillable
- N13.2 – Hydronephrosis with renal and ureteral calculous obstructionBillable
- N13.4 – HydroureterBillable
- N13.5 – Crossing vessel and stricture of ureter without hydronephrosisBillable
- N13.6 – PyonephrosisBillable
- N13.7 – Vesicoureteral-refluxHeader
- N13.8 – Other obstructive and reflux uropathyBillable
- N13.9 – Obstructive and reflux uropathy, unspecifiedBillable
Frequently asked questions
What is ICD-10 code N13.3?
N13.3 is the ICD-10-CM code for other and unspecified hydronephrosis, in the block N10-N16 (Renal tubulo-interstitial diseases).
Is N13.3 a billable code?
No. N13.3 is a header code with more specific child codes; report one of the billable codes listed above.
What category does N13.3 belong to?
It belongs to category N13 – Obstructive and reflux uropathy.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.