N16 vs N28.85
N16 (Renal tubulo-interstitial disorders in diseases classified elsewhere) compared with N28.85 (Pyeloureteritis cystica), 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. N16 carries an Excludes1 note covering N28.85: “pyeloureteritis cystica (N28.85)”
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
| N16Renal tubulo-interstitial disorders in diseases classified elsewhere | N28.85Pyeloureteritis cystica | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Renal tubulo-interstitial disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (N16). | Pyeloureteritis cystica is a billable ICD-10-CM diagnosis code (N28.85). |
| Includes | pyelonephritis Pyelonephritis Tubulo-interstitial nephritis | — |
| Code first | underlying disease, such as: brucellosis (A23.0-A23.9) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources