N13.2 vs N20
N13.2 (Hydronephrosis with renal and ureteral calculous obstruction) compared with N20 (Calculus 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?
Yes, when both are documented. N13.2 carries an Excludes2 note covering N20: “calculus of kidney and ureter without hydronephrosis (N20.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
No — do not report together. N20 carries an Excludes1 note covering N13.2: “that with hydronephrosis (N13.2)”
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
| N13.2Hydronephrosis with renal and ureteral calculous obstruction | N20Calculus 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 | Hydronephrosis with renal and ureteral calculous obstruction is a billable ICD-10-CM diagnosis code (N13.2). | Calculus of kidney and ureter is a non-billable ICD-10-CM category code (N20). |
| Includes | pyelonephritis | Calculous pyelonephritis |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources