N13 — Obstructive and reflux uropathy
Is N13 billable?
No — N13 is a non-billable header code. N13 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 18 billable codes beneath N13.
Billable codes under this header
- N13.0Hydronephrosis with ureteropelvic junction obstruction
- N13.1Hydronephrosis with ureteral stricture, not elsewhere classified
- N13.2Hydronephrosis with renal and ureteral calculous obstruction
- N13.4Hydroureter
- N13.5Crossing vessel and stricture of ureter without hydronephrosis
- N13.6Pyonephrosis
- N13.8Other obstructive and reflux uropathy
- N13.9Obstructive and reflux uropathy, unspecified
- N13.30Unspecified hydronephrosis
- N13.39Other hydronephrosis
- N13.70Vesicoureteral-reflux, unspecified
- N13.71Vesicoureteral-reflux without reflux nephropathy
- N13.721Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral
- N13.722Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral
- N13.729Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified
- N13.731Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral
- N13.732Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral
- N13.739Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified
N13 at a glance
| Code | N13 |
|---|---|
| Description | Obstructive and reflux uropathy |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here
The conditions below are not part of N13, but a patient may have both at the same time. When documentation supports it, N13 and the excluded code may both be reported.
Excludes1 — never code together — inherited from N10-N16
The conditions below can never be reported together with N13 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- pyeloureteritis cystica (N28.85)
Excludes2 — not included here — inherited from Chapter 14
The conditions below are not part of N13, but a patient may have both at the same time. When documentation supports it, N13 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
What codes fall under N13? (10)
- N13.0Hydronephrosis with ureteropelvic junction obstruction
- N13.1Hydronephrosis with ureteral stricture, not elsewhere classified
- N13.2Hydronephrosis with renal and ureteral calculous obstruction
- N13.3Other and unspecified hydronephrosisnot billable
- N13.4Hydroureter
- N13.5Crossing vessel and stricture of ureter without hydronephrosis
- N13.6Pyonephrosis
- N13.7Vesicoureteral-refluxnot billable
- N13.8Other obstructive and reflux uropathy
- N13.9Obstructive and reflux uropathy, unspecified
How long has N13 existed?
N13 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with N13?
ICD-10-CM declares these codes mutually exclusive with N13 — exactly one of each pair can be correct for a given encounter.