N13.4 vs N28.8
N13.4 (Hydroureter) compared with N28.8 (Other specified disorders of kidney and ureter), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. N28.8 carries an Excludes1 note covering N13.4: “hydroureter (N13.4)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| N13.4Hydroureter | N28.8Other specified disorders of kidney and ureter | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Hydroureter is a billable ICD-10-CM diagnosis code (N13.4). | Other specified disorders of kidney and ureter is a non-billable ICD-10-CM category code (N28.8). |
| Includes | pyelonephritis | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources