N13.30 — Unspecified hydronephrosis

N13.30

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

What this code means

Hydronephrosis is swelling of a kidney from urine building up behind a blockage; the cause is not specified here.

Also called: hydronephrosis.

When this code is used

Used for hydronephrosis, unspecified.

Where it sits in ICD-10-CM

Code N13.30 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.

Related symptoms

Back pain

Related anatomy

Kidneys

Frequently asked questions

What is ICD-10-CM code N13.30?

N13.30 is the ICD-10-CM diagnosis code for “Unspecified hydronephrosis”. Hydronephrosis is swelling of a kidney from urine building up behind a blockage; the cause is not specified here.

When is code N13.30 used?

Used for hydronephrosis, unspecified. 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.