N10 — Acute pyelonephritis

N10

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

What this code means

Acute pyelonephritis is a bacterial infection of the kidney itself, causing fever, loin pain and urinary symptoms.

Also called: acute pyelonephritis, kidney infection.

When this code is used

Used for acute pyelonephritis.

Where it sits in ICD-10-CM

Code N10 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

Related anatomy

Kidneys

Frequently asked questions

What is ICD-10-CM code N10?

N10 is the ICD-10-CM diagnosis code for “Acute pyelonephritis”. Acute pyelonephritis is a bacterial infection of the kidney itself, causing fever, loin pain and urinary symptoms.

When is code N10 used?

Used for acute pyelonephritis. 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.