N20.1 — Calculus of ureter

N20.1

ICD-10 Chapter 14: Genitourinary System — illustrative image — Chapter 14: Diseases of the genitourinary system (N00–N99) — illustrative image

What this code means

A stone (calculus) lodged in the ureter, the tube carrying urine from kidney to bladder, typically causing renal colic.

Also called: ureteral stone, calculus of ureter, ureterolithiasis.

When this code is used

Used for calculus of ureter.

Where it sits in ICD-10-CM

Code N20.1 belongs to Chapter 14: Diseases of the genitourinary system, which covers codes N00–N99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Learn more about this condition

Condition guide: Kidney Stones

Related symptoms

Back pain

Related anatomy

Kidneys

Watch: related videos

▶ WatchKidney and ureteral stone surgery

Frequently asked questions

What is ICD-10-CM code N20.1?

N20.1 is the ICD-10-CM diagnosis code for “Calculus of ureter”. A stone (calculus) lodged in the ureter, the tube carrying urine from kidney to bladder, typically causing renal colic.

When is code N20.1 used?

Used for calculus of ureter. It belongs to Chapter 14 of ICD-10-CM (Diseases of the genitourinary system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.